List of JavaScript Kata to Update - codewars/content-issues GitHub Wiki

This page lists JavaScript kata still stuck in Node 8.x. It's not grouped in any way at the moment.

Any help is appreciated, but I'm still looking for ways to automate common fixes. jscodeshift can be used to transform the code (see example). If you come up with a codemod, please create a similar demo on AST explorer and let me know on https://github.com/codewars/runner/issues/119. That issue also includes some background information.

Since Node 10.x, we've been using Mocha instead of the custom test framework. There are some required changes related to this.

  • The test structure must be describe -> it -> assertions or it -> assertions (i.e., assertions must be inside it, and it cannot be nested). Grouping related tests with describe is preferred if there are many test cases. Note that tests with an invalid test structure might still look valid in the output panel. Automated updates have skipped over those with invalid structure.
  • Test case callback passed to it is no longer immediately executed. This can be tricky to notice.
    • To avoid common issue with closure within a loop, all var within all tests have been upated to let when possible (if tests passed after the change).
  • Test case defined with a callback. Some authors likes to write it("test", _ => {}) which creates a asynchronous test (it("test", (done) => { doStuff().on("end", done); })). Most of these have been fixed.
  • Old assertions are still available in Node 10. It's also available in Node 12 with const Test = require("@codewars/test-compat");. Updating to Chai assertions can be done later with codemod, so it can be skipped.

Use the new "Fork" feature to update kata:

You don't need to open an issue/suggestion and wait to edit. Forking a kata in a language is similar to forking an approved translation, but better because

  • all languages can be forked, including those added directly in Kata Editor and the original language
  • it's never outdated because it forks from the kata

You should see "Fork" when viewing a kata with the language you've completed in selected. Click that to open a translation editor with the current version filled in. The proposed changes can be merged or rejected after publishing, just like translations.

Notes

Native BigInts in Node

Native BigInts are available in Node 10.x. JS versions of all BigInt katas (arithmetic operations to numbers represented as strings) should be removed once Node 8.x is deprecated in the future.

Though they should've been removed already anyway since bignumber.js is installed in the environment, which means require would have to be disabled. Which does nothing anyway because people can just copy the entire minified source code from the bignumber.js repo into their solution, and things go out of hand very quickly with this.

List of Node 12.x Kata

The following failed to upgrade to Node 14.x/18.x automatically.

  1. Bresenham Circle Algorithm
  2. Ludicrous Coloured Triangles

List of Node 10.x kata

The following failed to update automatically by prepending const Test = require('@codewars/test-compat'); to tests.

  1. Brick by Boring Brick - Mathematical expression interpreter
  2. Mad Mathematician's Calculator (Basic Version)
  3. Mad Mathematician's Calculator (Hardcore Version)
  4. one line task : date converter (not that date, the other one)

List of Node 8.x Kata

  1. "AURUM RECLUDIT CUNCTA" - yet another FUBAR kata with restrictions which relies on specific setup of Node 8.
  2. "console.log" and the Lexical "this"
  3. "string".forEachMatch(regex, callback, [context]);
  4. "TRaduttore".tr( [ "u", "tt" ] , "it" )
  5. (Insane) N Warriors and a Lamp
  6. (Ready for) Prime Time
  7. [AI] Play Me : CodeWarsRunner I (Introduction)
  8. [AI] Play Me : CodeWarsRunner II (Acceleration)
  9. [BF] Even or Odd?
  10. [BF] Fibonacci Sequence
  11. [BF] Quine
  12. [BF] Reverse input
  13. [BF] Sort string
  14. [BF] Squares
  15. # Counting 1: I Want Some Subsets, Not All!
  16. #For Kids# Date decryption.
  17. #For Kids# Date encryption.
  18. #01 - Music theory - Minor/Major chords
  19. #1 Sequences: Pure Even Digit Perfect Squares (P.E.D.P.S)
  20. #4 Matrices: Process for a Square Matrix
  21. #6 Matrices: How Many Matrices Do These Elements Produce?
  22. #7 Matrices: Focused on the Contour
  23. #8 Matrices: Up and Down Sorting For Each Column
  24. 1 Two 3 Four 5!
  25. 1RM Calculator
  26. 1st day of month that are Sunday in a year range
  27. 2 DNAs sequences, coding for same protein?
  28. 2048!
  29. 5command - Esoteric programming #1
  30. 5x5 Tap Code
  31. 7-segment converter
  32. 80's Kids #1: How Many Licks Does it Take?
  33. 80's Kids #10: Captain Planet
  34. 80's Kids #2: Help ALF Find His Spaceship
  35. 80's Kids #3: Punky Brewster's Socks
  36. 80's Kids #4: Legends of the Hidden Temple
  37. 80's Kids #5: You Can't Do That on Television
  38. 80's Kids #6: Rock 'Em, Sock 'Em Robots
  39. 80's Kids #7: She's a Small Wonder
  40. 80's Kids #8: The Secret World of Alex Mack
  41. 80's Kids #9: Down in Fraggle Rock
  42. 8kyu interpreters: HQ9+
  43. A (no more) bugs trilogy: Episode 3 - Make a Player
  44. A Banking Trouble
  45. A bugs trilogy: Episode 1 - "Let Math.Random(); decide your future"
  46. A Crazy Robot? Who's is behind the scenes to make that?
  47. A for Apple
  48. A functional deck of cards....
  49. A kata is a kata, you can't say it's only a half!
  50. A Man and his Umbrellas
  51. A Memory game array
  52. A Promise is a Promise
  53. A simple Tic-tac-toe class
  54. A Taste of Curry
  55. Aaaaaand theeeeeen
  56. ABC - Esoteric programming #2
  57. Abstract Model Magic
  58. Accumulator Calculator
  59. ACME factory needs your help
  60. Acute, Obtuse, or Right?
  61. AD2070: Help Lorimar troubleshoot his robots- ultrasonic distance analysis
  62. AD2070: Help Lorimar troubleshoot his robots-Search and Disable
  63. Add Length
  64. Add new item (collections are passed by reference)
  65. Adding Arrays
  66. Adding Big Numbers
  67. Adding Binary Numbers
  68. Additionless addition.
  69. Additive Numbers
  70. Advanced Events
  71. After(?) Midnight
  72. Age Range Compatibility Equation
  73. Alex & snooker: points earned.
  74. Alex & snooker: scores.
  75. Alfred's Laundry Robot
  76. Algebraic Lists
  77. Aliens have landed
  78. All Balanced Parentheses
  79. All representations as binomial coefficient, or: How often in Pascal's Triangle ?
  80. All Star Code Challenge #12
  81. All Star Code Challenge #17
  82. All Star Code Challenge #18
  83. All Star Code Challenge #32
  84. All that is open must be closed...
  85. All unique
  86. Alphabet symmetry
  87. Alphabetic Anagrams
  88. Alphabetical Sequence
  89. Alphabetize a list by the nth character
  90. Alphametics Solver
  91. Alternate capitalization
  92. Alternate Square Sum
  93. altERnaTIng cAsE <=> ALTerNAtiNG CaSe
  94. Alternating Loops
  95. Alternative Truth Machine
  96. Am I safe to drive?
  97. Amidakuji
  98. Amount to Coins - Universal
  99. An 'orrible expression on 'is face
  100. An Eventful Bus
  101. Anagram difference
  102. And the Mosckar goes to…
  103. Angle-a-trons and Phyllotaxy
  104. Angular modules
  105. Anonymous Returns.
  106. Answering questions about data with Lo-Dash - 1
  107. Antipodal Points with Same Temperature
  108. AOP - After
  109. Apparently-Modifying Strings
  110. Apply offset to subtitles
  111. Approving Kata
  112. Approximate Fractions
  113. Are arrow functions odd?
  114. Are the values equal?
  115. Are there any arrows left?
  116. Are they the "same"?
  117. Are we alternate?
  118. Are You a One-Liner? #1: divide 2,3,5,7
  119. Are You a One-Liner? #2: multiplication table
  120. Are You a One-Liner? #3: A4 Paper
  121. Are you Geometric or Arithmetic? No, I´m both of them.
  122. Area and perimeter of the ellipse
  123. Area of a Circle
  124. Area of a Square
  125. Area of House from Path of Mouse
  126. Area or Perimeter
  127. Arguments to Binary addition
  128. Array combinations
  129. Array Deep Count
  130. Array element parity
  131. Array Graphics - Lines
  132. Array Info
  133. Array power
  134. Array reduction
  135. Array to HTML table
  136. Array.prototype.push
  137. Array.prototype.splice(from, count, insertItems...)
  138. Array.prototype.splice(from, count, insertItems...) - Advanced
  139. Arrays are Objects
  140. Arrays of cats and dogs
  141. Arrays of Lists of Sets
  142. Article archive and social likes
  143. Ascend, Descend, Repeat?
  144. Ascii Art Generator
  145. ASCII Games: Dance Dance Evolution I
  146. ASCII Games: Flood Fill (Player)
  147. ASCII Games: Warning: Ice!
  148. ASCII hex converter
  149. Assembler interpreter (part II)
  150. Assorted Rectangular Pieces Puzzle
  151. Atbash Cipher Helper
  152. ATM Heist
  153. Authenticate a list of usernames
  154. Auto Sorted Array - Easy
  155. Autocomplete! Yay!
  156. Automaton (Part 2)
  157. Automaton (Part 3)
  158. Automorphic Number (Special Numbers Series #6)
  159. Average Scores
  160. Back to KinderGarten (eeeeeeasy)
  161. Back to KinderGarten 3 : What's this list ? (easy?)
  162. Back to KinderGarten II : Where's Aïcha ? (eeeasy)
  163. Back to the Future?
  164. Balance the arrays
  165. Balance the parentheses
  166. Balance the tree
  167. Ball Launcher Robot
  168. Ball Roll On Quartic Polynomial
  169. Bar Graph - Graphing #1
  170. Barbell racking calculator
  171. Barbell weight
  172. Base64 Encoding
  173. Baseball
  174. Basic Compression
  175. Basic JS - Building a calculator
  176. Basic markdown to HTML
  177. Basic neural networks - Machine Learning #2
  178. Basics - Generators #1
  179. Basics 04: Rotate Matrix
  180. Basket of Fruits
  181. Batman Quotes
  182. Bầu cua tôm cá
  183. BBQ Pitmaster
  184. Be Concise I - The Ternary Operator
  185. Be Concise II - I Need Squares
  186. Be Concise III - Sum Squares
  187. Be Concise IV - Index of an element in an array
  188. Beautiful STAR
  189. BECOME IMMORTAL
  190. Beeramid
  191. Begin your day with a challenge, but an easy one.
  192. Beginner Series #2 Clock
  193. Behind Enemy Lines
  194. Berlin Clock
  195. Berserk rater: CG Vs. Clang
  196. Bet payout calculator
  197. Bicycle gear inch calculator
  198. Big Arithmetic - integer add/subtract
  199. Big Integer Modulo
  200. Big integers sum
  201. Big number problem
  202. Bin to Decimal
  203. Binary Genetic Algorithms
  204. Binary scORe
  205. Binary string
  206. Binary Swap
  207. Binary sXORe
  208. Binary to string
  209. Binary Zoo
  210. Binding within the List Monad
  211. BIO 2013 : Watching the Clock
  212. bit "Wise" #1: XOR-cism
  213. Bit calculator
  214. Bit Plane Return
  215. BitMath: Addition
  216. BitMath: Multiplication
  217. Bitty Words
  218. Blobservation
  219. Block-exchanging reverse
  220. Bloxorz Solver
  221. Boardgame Fight Resolve
  222. Bob - The Automated Manager
  223. Bob's Secret Cipher
  224. Body mass index calculation
  225. Boggle Word Checker
  226. Boolean logic from scratch
  227. Bouncing Ball
  228. Bracket Duplicates
  229. Brainscrambler - Esoteric programming #3
  230. Branch Prediction
  231. Breadcrumb Generator
  232. Breadth-First DOM Traversal
  233. Bribe the Guards of the Crown Jewels
  234. Broken Image - Puzzles #1
  235. Broken sequence
  236. Build a pile of Cubes
  237. Build a Trie
  238. Building a mini search engine
  239. Building a Sequence Cocatenating Digits with a Given Order.
  240. Building blocks
  241. Building Strings From a Hash
  242. Bulk up!
  243. Burrows-Wheeler transform I. Coding
  244. Burrows-Wheeler transform II. Decoding
  245. Buying a car
  246. Buying the Farm : Irrigation
  247. Caesar Cipher Encryption - Variation
  248. Caesar Cipher Helper
  249. Caffeine Script
  250. Calculate age in years
  251. Calculate Hypotenuse of Right-angled Triangle
  252. Calculate mean and concatenate string
  253. Calculate number of inversions in array in linearithmic time
  254. Calculate Price Excluding VAT
  255. Calculate the required interest rate
  256. Calculate Two People's Individual Ages
  257. Calculating Expected Utility
  258. Calculating with Functions
  259. Calculating with objects
  260. Calculator (Addition and Spaces) [Part 1]
  261. Calendar Week
  262. Callback Set
  263. Cambridge Word Scramble
  264. CamelCase Method
  265. Can I have cake?
  266. Can you get the loop ?
  267. Can you keep a secret?
  268. Can you move to Zephland?
  269. Can you test it for me?
  270. Candy count
  271. Candy problem
  272. Capitalize first letter of a string
  273. Capitals first!
  274. Car Door Roulette - Harder Version
  275. Card Counting
  276. Card game
  277. Card game: twenty-one
  278. Cartesian coordinates from degree angle
  279. Cartesian neighbors
  280. Cartesian neighbors distance
  281. Case Reversal of Consecutive Duplicates
  282. Catch me if you can (rolling start)
  283. Centroid I
  284. Champernowne's Championship
  285. Change it up
  286. char_to_ascii
  287. Character Concatenation
  288. Character limits: How long is your piece of string?
  289. Cheating a bit...
  290. Check a Curious Divisibility. (Brute force version)
  291. check for winning box in dots and boxes game
  292. Check if a triangle is an equable triangle!
  293. Check if number is prime without loops
  294. Check if two words are isomorphic to each other
  295. Check RNA Nucleotides
  296. Check three and two
  297. Check your arguments
  298. Checkerboard King Combo Move
  299. Chess piece values
  300. Chessboard Squares Under Queen's Attack
  301. Chicken Sexing
  302. Chinese Zodiac
  303. Chocolate Celebration
  304. Chocolate Party
  305. Choose featured projects for Gratipay's homepage!
  306. Christmas baubles on the tree
  307. Chuck Norris I - Push Ups
  308. Chuck Norris II - One Punch
  309. Chuck Norris VI - Shopping with Chuck
  310. Chuck Norris VII - True or False? (Beginner)
  311. Church numbers
  312. Cipher
  313. Circular Objects #1 - Running around in circles
  314. Class conundrum - Bug Fixing #7
  315. Classy Classes
  316. Classy Extentions
  317. Clay Pigeon Shooting
  318. Clean up your Gibberish!
  319. Clean your shoes rack
  320. Climbing the Leaderboard
  321. Clock Hands
  322. Clock Patience
  323. Closest and Smallest
  324. Closest elevator
  325. Closest friends
  326. Closest to Zero
  327. Clue - Esoteric programming #4
  328. Code Adventurer Guild: BeiJing
  329. Code Adventurer Guild: HongKong
  330. Code-ilocks. This exercise is JUST RIGHT!
  331. Codewars style ranking system
  332. Coding 3min : A*B=C
  333. Coding 3min : Are they symmetrical?
  334. Coding 3min : Balance Attraction
  335. Coding 3min : Count animals
  336. Coding 3min : Eat watermelon
  337. Coding 3min : Excel Puzzle #1
  338. Coding 3min : Excel Puzzle #2
  339. Coding 3min : Find the murderer
  340. Coding 3min : Guess the Hat
  341. Coding 3min : Hacker and change
  342. Coding 3min : Half it II
  343. Coding 3min : Half it III
  344. Coding 3min : Half it IV
  345. Coding 3min : Max Value
  346. Coding 3min : Parallel circuit
  347. Coding 3min : Planting Trees
  348. Coding 3min : Reading a Book
  349. Coding 3min : Remove screws I
  350. Coding 3min : Remove screws II
  351. Coding 3min : Series circuit
  352. Coding 3min : Tidy up the room
  353. Coding 3min : toLoverCase()
  354. Coding 3min : Waiting for a Bus
  355. Coding 3min: Bug in Apple
  356. Coding 3min: Collatz Array(Split or merge)
  357. Coding 3min: Father and Son
  358. Coding 3min: Give me the equation
  359. Coding 3min: Trypophobia
  360. Coding Meetup #10 - Higher-Order Functions Series - Create usernames
  361. Coding Meetup #15 - Higher-Order Functions Series - Find the odd names
  362. Coding with Squared Strings
  363. Collatz
  364. Collision Detection
  365. Color Ghost
  366. Color of the moment
  367. Colored Hexes!
  368. Coloured Lattice Points Forming Coloured Triangles
  369. Combine objects
  370. Combining Records
  371. Common array elements
  372. Common Bit Twiddles
  373. Compact data processing: bit comparison
  374. Compare powers
  375. Competitive eating scoreboard
  376. Complete The Pattern #10 - Parallelogram
  377. Complete The Pattern #11 - Plus
  378. Complete The Pattern #12
  379. Complete The Pattern #13
  380. Complete The Pattern #14
  381. Complete The Pattern #15
  382. Complete The Pattern #16
  383. Completed Mahjong Hands
  384. Complex numbers
  385. Composed Integers Having Prime Factors Only Once
  386. Composing squared strings
  387. Compound Nouns, Common Nouns, and Adjectives Test
  388. CompoundArray
  389. Compression : impossible
  390. Computational Geometry 101: Perimeter and Area of an arbitrary shape (2D)
  391. Compute a convex hull
  392. Compute the Largest Sum of all Contiguous Subsequences
  393. Compute Unix path
  394. Concatenating functions
  395. Concatenation substring
  396. Conference Traveller
  397. Config Parsing: INI
  398. Configure an express server
  399. Connect Four
  400. Connect Four: Unlimited Edition
  401. Connected blocks
  402. Connected blocks (second part)
  403. Consecutive Count
  404. Consecutive k-Primes
  405. Consecutive strings
  406. Conservative Property Proxy
  407. Consonant value
  408. Constrained GCD
  409. Contact Deduplication
  410. Contamination #1 -String-
  411. Control the Beast (controlled components in ReactJS)
  412. Convert an array of strings to array of numbers
  413. Convert Hash To An Array
  414. Convert PascalCase string into snake_case
  415. Convert Sentences to New York, my guy.
  416. Convert the score
  417. Converter
  418. Converting integer to currency format
  419. Conway's Game of Life - Unlimited Edition
  420. Coordinates Validator
  421. Coprimes up to N
  422. Cost of Shopping
  423. Count all the sheep on farm in the heights of New Zealand
  424. Count chains of ones in subsequences
  425. Count the Combinations
  426. Count the connected components
  427. Count the divisible numbers
  428. Count the number of cubes with paint on
  429. Count the Ones
  430. Count the smiley faces!
  431. Count The Zeros: 1 to n
  432. Count word occurrences
  433. Countdown - Longest Word
  434. Countdown to Christmas
  435. Counting DNA Nucleotides
  436. Counting Duplicates
  437. Counting E-Primes
  438. Counting in English one, two, three... to 2 Quadrillion (2,000,000,000,000,000)
  439. Counting Nested Functions
  440. Counting Sort
  441. Counting String Subsequences
  442. Covfefe
  443. Cracking CRC32
  444. Crash Override
  445. Crashing Boxes
  446. Cream of the crop
  447. Create 10x10 array and randomly fill each cell with "A", "B", "C", or "D"
  448. Create a frame!
  449. Create a House Cleaning Rota
  450. Create a password hashing function.
  451. Create Four Letter Birding Codes from Bird Names
  452. Create palindrome
  453. Create the base - Dungeon crawler #1
  454. Create Your Own "Promise.all()"
  455. Creating Elements with React
  456. Credit Card Checker
  457. Cross the Bridges
  458. Crossed words
  459. Crouching Distribution, Hidden Constant
  460. Crushing blows and blushing crows
  461. Cryptic Cave: Episode 1
  462. Cryptography Challenge - Log of Lights
  463. CSV representation of array
  464. Currency Conversion
  465. Currying functions: multiply all elements in an array
  466. Custom Array Filters
  467. Custom concat() Array Method
  468. Custom each() Array method
  469. Custom Setters and Getters
  470. Cut array into smaller parts
  471. Cut me in Pieces but in The Way I Like
  472. D&D Character generator #1: attribute modifiers and spells
  473. D&D Character generator #2: psion power points
  474. D&D Character generator #3: carrying capacity
  475. Dangerous Dates
  476. Dashatize it
  477. dataTypes String to Array
  478. Date Format Validation
  479. Date formatter
  480. Date Sanity Methods
  481. Dave's gamble.
  482. Days in the year
  483. Debug Sum of Digits of a Number
  484. Decibel Scale
  485. Decipher the Message
  486. Decipher this!
  487. Decode Morse
  488. Decode the Morse code
  489. Decode the Morse code, advanced
  490. Decode the Morse code, for real
  491. Decoded String by the Numbers
  492. Decompose double strand DNA into 6 reading frames
  493. Decreasing Inputs
  494. Decrypt this school cipher
  495. Deep Assignment
  496. Deep Freeze
  497. Defeat the Elemental Titans
  498. Defend your castle
  499. Deferred Objects
  500. Déjà vu Duplicates
  501. Delete occurrences of an element if it occurs more than n times
  502. Deletion in an array
  503. Delta Bits
  504. Depot organization 1
  505. Derive Cipher from Plaintext
  506. Describe the shape
  507. Design a simple markdown compiler with string substitution feature
  508. Determine Results of Pole Vault Competition
  509. Devil's Sequence
  510. DevOps legacy roasting -> disco inferno -> burn baby burn
  511. Diamonds and Toads
  512. Dice roll - D&D #1
  513. Dice Rolling
  514. Did she say hallo?
  515. Difference between two collections
  516. Difference Of Squares
  517. DigitAll
  518. Digits Average
  519. Disarium Number (Special Numbers Series #3)
  520. Distance Between 2 Points on a Cartesian Plane
  521. Distance from the average
  522. Distribute server workload
  523. Divide integers as strings
  524. Divide numbers as strings
  525. Divisible by previous digit?
  526. Divisor harmony
  527. DNA GC-content
  528. Do something "n.times" (Simplifying "for" loops)
  529. Do you speak "English"?
  530. Do you speak retsec?
  531. Dollars and Cents
  532. Dominant array elements
  533. Dominant primes
  534. Domino Tiling - 2 x N Board
  535. Domino Tiling - 3 x N Board
  536. Domino Tiling - 5 x 2N Board
  537. Domino Tiling - M x N Board with Holes
  538. Don't Drink the Water
  539. Don't get stressed
  540. Don't rely on luck HARDCORE
  541. Dont drive too long!
  542. Doomsday Basic
  543. DOS era #1: Help!!!
  544. DOS era #2: Attrib
  545. Dota 2 Bots - Pudge's Meat Hook
  546. Double Rainbow!
  547. Double Trouble
  548. Down Arrow With Numbers
  549. Draw a Circle.
  550. Dream Or Reality
  551. Dreidel dreidel
  552. Driving Licence
  553. Driving School Series #2
  554. Drunk friend
  555. Drying Potatoes
  556. Duck Duck Goose
  557. Dude E Free
  558. Dumb News: The Truth About CW Leaderboard !
  559. Dummy Epoch - find the gap
  560. Duplicate Arguments
  561. Duplicates. Duplicates Everywhere.
  562. Easy Cyclist's Training
  563. Easy Diagonal
  564. Easy Line
  565. Easy mathematical callback
  566. Easy Time Convert
  567. Echo
  568. Elections: Weighted Average
  569. Element equals its index
  570. Elevator algorithm
  571. Elevator Distance
  572. Elevator with call buttons
  573. Ellipse contains point?
  574. Elo rating - one game, one pair
  575. Email Validation
  576. Emily's Eccentric Encoding
  577. Emirps
  578. English beggars
  579. Enumerable Magic - Does My List Include This?
  580. Enumerable Magic #1 - True for All?
  581. Enumerable Magic #4 - True for None?
  582. Enumerable Magic #5- True for Just One?
  583. Equation Discovery
  584. Equivalent Dice
  585. Error Throwing - Error Handling #2
  586. ES2015: Get the real length of string. 
  587. ES6 string addition
  588. Escape the maze
  589. Esolang Interpreters #1 - Introduction to Esolangs and My First Interpreter (MiniStringFuck)
  590. Especially Joyful Numbers
  591. esrever esreveR!
  592. Euclidean distance in n dimensions
  593. Evaluate a postfix expression
  594. Even Binary Sorting
  595. Even numbers in an array
  596. Even odd disparity
  597. Even Odd Pattern #1
  598. Every archer has its arrows
  599. Every possible sum of two digits
  600. Everything Is Even
  601. Evil Autocorrect Prank
  602. Excel sheet column numbers
  603. Exclamation marks series #4: Remove all exclamation marks from sentence but ensure a exclamation mark at the end of string
  604. Exclusive "or" (xor) Logical Operator
  605. Exclusive presentations
  606. Expression Transpiler
  607. Expressive Objects
  608. Extended weekends
  609. Extended Weekends - Challenge Edition
  610. Extending JavaScript Objects: Contains Method
  611. Extending JavaScript Objects: Get First & Last Array Element
  612. Extending JavaScript Objects: Reverse String
  613. Extending JavaScript Objects: Simple Math Methods
  614. Extra Perfect Numbers (Special Numbers Series #7)
  615. extract file name
  616. Extract the IDs from the data set
  617. Fabergé Easter Eggs crush test
  618. Fac Recursion (Pest control - find the bugs and fix them)
  619. Factorial
  620. Factorial length
  621. Factory Functions #1 - Creating profile for people
  622. Factory Functions #2 - Inheritance and Object Composition
  623. Failed Filter - Bug Fixing #3
  624. Failed Sort - Bug Fixing #4
  625. Fake website #1: Choose a good name for the website
  626. Fake website #2: Choose a best server to create website
  627. Fake website #3: Choose a cool color for the web site
  628. Fake website #4: Design a strict user registration verification function
  629. Fake website #6: Design an automatic beta katas processing function
  630. Fame Of All
  631. Fast/Precise Natural Logarithm
  632. Fastest Code : A*B=C
  633. Fastest Code : Count animals
  634. Fastest Code : Equal to 24
  635. Fastest Code : Excel Puzzle #2
  636. Fastest Code : Half it III
  637. Fastest Code : Half it IV
  638. Faulty Data Recovery
  639. Feed Kahumolings!
  640. Feynman's square question
  641. Fibo akin
  642. Fibonacci Generator
  643. Fibonacci, Tribonacci and friends
  644. Fifa 17 Launch
  645. Figure Out the Notes
  646. File Finder
  647. File Size Trouble!
  648. Fill in the gaps in my timesheet.
  649. Filling an array (part 1)
  650. Filling an array (part 2)
  651. Filter out for good!
  652. Filter valid romans
  653. Financing Plan on Planet XY140Z-n
  654. Find Cracker.
  655. Find a Bunch of Common Elements of Two Lists in a Certain Range
  656. Find a Very Special Set Of Numbers In a Certain Range
  657. Find All Array Values That Fall Within a Given Difference
  658. Find all non-consecutive numbers
  659. Find all occurrences of an element in an array
  660. Find an area
  661. Find array
  662. Find Factors Down to Limit
  663. Find Fibonacci last digit
  664. Find Grid Position
  665. Find heavy ball - level: conqueror
  666. Find heavy ball - level: master
  667. Find heavy ball - level: novice
  668. Find heavy ball - level: ubermaster
  669. Find last Fibonacci digit [hardcore version]
  670. Find me the names
  671. Find min and max
  672. Find Multiples of a Number
  673. Find Nearest square number
  674. Find number in an array # 2
  675. Find number in an array # 3
  676. Find number in an array # 4
  677. Find number in an array # 5
  678. Find number in an array # 6
  679. Find Number With Maximum Number Of Divisors
  680. Find Numbers with Same Amount of Divisors
  681. Find out the longest string chain
  682. Find out whether the shape is a cube
  683. Find sum of top-left to bottom-right diagonals
  684. Find the area of the rectangle!
  685. Find the calculation type
  686. Find the Capitals
  687. Find the discounted prices
  688. Find The Duplicated Number in a Consecutive Unsorted List - Tougher Version
  689. Find the force of gravity between two objects
  690. Find the Golden Ticket!
  691. Find the hobbits!
  692. Find the Integral
  693. Find the Location for the Wildlife Study
  694. Find the longest gap!
  695. Find The Max Sum Of Contiguous-Submatrix In a Matrix - Ultimate Version
  696. Find the Middle of the Product
  697. Find the Mine!
  698. Find the missing element between two arrays
  699. Find the missing term in a Geometric Progression
  700. Find the missing term in an Arithmetic Progression
  701. Find the Most Probable Sum Value or Values, in Rolling N-dice of n Sides
  702. Find the motif in DNA sequence.
  703. Find the Nexus of the Codewars Universe
  704. Find the Nth longest string in an Array
  705. Find the odd int
  706. Find The Parity Outlier redux
  707. Find the position!
  708. Find the smallest
  709. Find the sum of the roots of a quadratic equation
  710. Find the Word Pair!
  711. Find Transcription Factors
  712. Find whether there is a route between two nodes in a graph
  713. Find within array
  714. Find X
  715. Finding North
  716. Finding Remainder Without Using '%' Operator
  717. Finding the Closest Maximum Values of a Function to an Upper Limit
  718. Finish this Mini Sudoku
  719. First n Prime Numbers
  720. First-Class Function Factory
  721. Fix arithmetic progression
  722. Fix array sequence
  723. Fix string case
  724. Fix your code before the garden dies!
  725. Fixed length palindromes
  726. FIXME: Get Full Name
  727. Fizz Buzz - Without ifs
  728. Fizz Buzz Reloaded
  729. FizzBuzz Backwards
  730. Flexible Card Game
  731. Flight incident probabilities
  732. Floating-point Approximation (II)
  733. FloatStream
  734. Fly as fast as you can
  735. Follow that Spy
  736. Following Sierpinski's Footprints
  737. Following the Paths of Numbers Through Prime Factorization
  738. Food combinations
  739. For the sake of argument
  740. For Twins: 1. Types
  741. For UFC Fans (Total Beginners): Conor McGregor vs George Saint Pierre
  742. Format data value
  743. Format Text
  744. Forming a Magic Square
  745. Four Pass Transport
  746. Foxes and rabbits
  747. Free pizza
  748. Frequency Analysis With Buckets
  749. Freudian translator
  750. Friday the 13th Part 1
  751. Frugal Pizza
  752. Fruit Machine
  753. Fruit string calculator
  754. Fuel economy converter (mpg <-> L/100 km)
  755. Fuel usage reporting
  756. Fun with ES6 Classes #1 - People, people, people
  757. Fun with ES6 Classes #2 - Animals and Inheritance
  758. Fun with ES6 Classes #3 - Cuboids, Cubes and Getters
  759. Fun with ES6 Classes #4 - Cubes and Setters
  760. Function Cache
  761. Function Wrappers: Inline Testing
  762. Function Wrappers: pool
  763. Function.prototype.clone
  764. Functional Addition
  765. Functional Binary Trees
  766. Functional Lists
  767. Functions of Integers on Cartesian Plane
  768. functions waterfall!
  769. Funny jubilees
  770. Future
  771. Game Hit the target - 2nd part
  772. Gaussian primes
  773. Generate a random number (the hard way!)
  774. Generate An Array of Unique Strings
  775. Generate range of integers
  776. Generate user links
  777. Generating Generators - Generators #3
  778. Generic Ball Clock
  779. Genetic Algorithm Series - #1 Generate
  780. Genetic Algorithm Series - #3 Crossover
  781. Geohashing
  782. Geometric Mean I
  783. Geometric Progression Sequence
  784. Geometry Basics: Circle Area in 2D
  785. Geometry Basics: Distance between circles in 2D
  786. Geometry Basics: Distance between points in 3D
  787. Geometry Basics: Triangle Area in 2D
  788. Geometry Basics: Triangle Perimeter in 2D
  789. Gerrymander Solver
  790. Get all array elements except those with specified indexes
  791. Get angle between hour and minute hands
  792. Get array elements with specified keys
  793. get ascii value of character
  794. get character from ASCII Value
  795. Get Password from grid
  796. Get root property name
  797. Get Smallest Common Factor
  798. Get the Excel column title!
  799. Get the Grid Coordinates
  800. Get your steppin' on son
  801. Get Zodiac Sign
  802. Getting along with Bernoulli's numbers
  803. Give me a Diamond
  804. Give me DST !!!
  805. Give me the k first digits. Odd digits.
  806. Global estimates
  807. Goldbach’s Conjecture
  808. Gotta start somewhere - Code Tracker #1
  809. GPS Navigation
  810. Grandpa's pants
  811. Graphics Series #1: barcode EAN-13 part1
  812. Graphics Series #2: barcode EAN-13 part2
  813. Graphics Series #3: Repair the LED display
  814. Graphics Series #4: Fireworks
  815. Graphics Series #5: The rope is burning
  816. Graphics Series #6: Traffic lights check
  817. Grasshopper - Function syntax debugging
  818. Grasshopper - Object syntax debug
  819. Grasshopper - Terminal Game #1
  820. Greatest Common Factor of an Array
  821. Greatest Difference
  822. Green Glass Roof- Puzzles #6
  823. Grocer Grouping
  824. Group Repeating Fractions
  825. Gryffindor vs Slytherin Quidditch Game
  826. Guess the array
  827. Guess the list pattern #2
  828. Guess the number!
  829. Hack My Account!
  830. Hacker's job
  831. Haiku Wizard
  832. Half Life
  833. Hall Of Fame
  834. Hamming(7,4) code - Message encoding
  835. Hamster me
  836. Handy Toolbox for Kata authors
  837. Hangman
  838. Hangman game
  839. Hangŭl Unicode From Jamo Values
  840. Hannah vs. Snooze Button
  841. Happy New Year, 2018 !!
  842. Happy numbers
  843. Happy numbers to the n power
  844. Hard Time Bomb
  845. Harry and the Mathematician's Chicken
  846. Haskell scanl function
  847. heggeleggleggo
  848. Hello Happy Codevarrior!
  849. Help Mrs Jefferson
  850. Help Green Lantern with his web site
  851. Help Kiyo きよ solve her problems LCM Fun!
  852. Help Mr. E
  853. Help Mr... Dr. Strange to bargain!
  854. Help Suzuki pack his coal basket!
  855. Help Suzuki purchase his Tofu!
  856. Help the general decode secret enemy messages.
  857. Help your fellow warrior!
  858. Help Yumi collect all the rings. Part 1
  859. Heroes of Might & Magic II: One-on-One
  860. Heroes of Might & Magic II: Chain Lightning
  861. Hex class
  862. Hex to base64
  863. Hex Word Sum
  864. hidden key
  865. Hide from the Sun
  866. Hide password from jdbc url
  867. Hide phone numbers
  868. Highest number with two prime factors
  869. Hit Count
  870. Hofstadter Q
  871. Hold'em Holecard Combinatorics
  872. Holiday IV - Leg Room
  873. Holiday VI - Shark Pontoon
  874. Holiday X - Bintang Vests
  875. Hollow Triangle
  876. Homogenous arrays
  877. Horror Top Trumps (card game)
  878. House of cards
  879. How deep do these trees even go?
  880. How far can you pedal a bike???
  881. How Green Is My Valley?
  882. How long should you cook this for?
  883. How long will it take the train to reach its final destination?
  884. How low do you go?
  885. How many consecutive numbers are needed?
  886. How many cows do you have?
  887. How Many Differences of Squares?
  888. How many dots are covered
  889. How many eggs?
  890. How many feelings?
  891. How many numbers III?
  892. How Many Numbers?
  893. How Many Numbers? II
  894. How many palindromes can you find ? (performance)
  895. How many times should I go?
  896. How much coffee do you need?
  897. How much Wood?
  898. How old will I be in 2099?
  899. HTML DOM: Part 1 - Tree
  900. HTML DOM: Part 2 - Attributes
  901. Human Friendly Random Numbers
  902. Human readable duration format
  903. Human readable working hours
  904. Hungarian Vowel Harmony (harder)
  905. I guess this is a 6kyu kata #10: Emotion of sentences
  906. I guess this is a 6kyu kata #2: Merge strings
  907. I guess this is a 6kyu kata #3: Trim the Christmas tree
  908. I guess this is a 6kyu kata #5: Whac-A-Mole
  909. I guess this is a 7kyu kata #1: Search result
  910. I guess this is a 7kyu kata #4: Find 0 and 1
  911. I guess this is a 7kyu kata #6: Fruit Ninja I
  912. I love big nums and I cannot lie
  913. I need a lookup quick!
  914. I need more speed!
  915. I Promise Not To Optimize
  916. I Spy
  917. I'm already Tracer
  918. I'm longer than you!
  919. Ideal electron distribution
  920. Identify the array's ordering
  921. Image Files Only
  922. Image Processing
  923. Imaginary Base Conversion
  924. Imperfect Fibonacci Rabbits
  925. Imperfect Network #1 (duplicate messages)
  926. Imperfect Network #2 (out-of-order messages)
  927. Implement "The Match" to assign med school graduates to hospitals
  928. Implement brute force protection
  929. Implement Debounce
  930. Implementing a Queue
  931. Implementing a Queue - Performance Version
  932. Implied Probability from Fractional Betting Odds
  933. Indexed capitalization
  934. Infinite Diceworks: MeanMaxing your rolls
  935. Infinite Diceworks: MeanMaxing your rolls (Quantum Mechanically)
  936. Infinite Sequences
  937. Ins and Outs--Play game Series #6:
  938. Insane Permutation Promenade (from AoC 2017 Day 16)
  939. Insert Dashes 2
  940. Insert into xml object - xml #3
  941. Insert value into an array
  942. Inserting multiple strings into another string
  943. Inspiring Strings
  944. Instant Runoff Voting
  945. Integer depth
  946. Integer reduction
  947. Integer to Musical Pitch Classes
  948. Integer triangles
  949. Integer Triangles Having One Angle The Double of Another One
  950. Integer with the longest Collatz sequence
  951. Integers Sum Square
  952. Interactive Dictionary
  953. Interesting Pyramid
  954. Interlaced Spiral Cipher
  955. Invalid Input - Error Handling #1
  956. IP Validation
  957. IPv6 address validation and contraction
  958. IPv6 validator
  959. Is a Prime?
  960. Is Divisible By 6 Mk II
  961. Is Integer Array?
  962. Is It In?
  963. Is n divisible by (...)?
  964. Is there a sequence re-occuring in the list
  965. Is there an arrow missing ? (Relations - Part1: Reflexivity)
  966. Is this working?
  967. Is Undefined?
  968. Is your period late?
  969. isAN(value)
  970. isInt32(int, byteLength)
  971. ISRC - Significant Figures
  972. isReallyNaN
  973. It's Full of Stars
  974. Iterative Rotation Cipher
  975. Japanese Romaji-to-Hiragana Converter
  976. Java format Unicode encoder/decoder
  977. JavaScript class-like objects
  978. Javascript filter - 1
  979. Javascript filter - 2
  980. Javascript filter - 3
  981. Javascript from the Inside #1 : Map
  982. Javascript from the Inside #2: Filter
  983. Javascript Mathematician
  984. JavaScript seems to be broken
  985. Jewel Thief
  986. John and Ann sign up for Codewars
  987. Join command (simplified)
  988. Jokes you've been 'awaiting' for ... promise
  989. Josephus Permutation
  990. Josephus Survivor
  991. JS Golfing #1: undefined
  992. JS Golfing #2: Math.floor
  993. JS Golfing #3: Math.round
  994. JS Golfing #4: Math.random
  995. JS Golfing #5: A Million Times
  996. JS Golfing #6: String Summation
  997. JS Golfing #7: Join
  998. JS Golfing #8: Is it Uppercase?
  999. JSON Account Updater
  1000. JSON Parser
  1001. Jumble words
  1002. Jump!
  1003. Jumping Kangaroos
  1004. Jumping Number (Special Numbers Series #4)
  1005. Jurassic Word
  1006. Just Adding and Multiplying
  1007. Kama Sutra Cipher Helper
  1008. Kaprekar Split
  1009. Kaprekar's Routine
  1010. Karnaugh's detonating timer (a k-map primer)
  1011. Kata Impossible I - The Impossible Lottery
  1012. Kebabize
  1013. Keypad horror
  1014. Keys, their drawings and ancient symbols
  1015. Keyword Cipher Helper
  1016. Kids and candies
  1017. KISS - Keep It Simple Stupid
  1018. Knapsack Part 1 - The Greedy Solution
  1019. Kushim the Accountant: Extract $ values from text
  1020. L1: Bartender, drinks!
  1021. Large Factorials
  1022. Larger Product or Sum
  1023. Largest Cross Sum
  1024. Largest Elements
  1025. Largest Palindromic Product
  1026. Largest product in a series
  1027. Last
  1028. Last and rich in circle
  1029. Last Digit of an Array
  1030. Last digit of a huge number
  1031. Last digit symmetry
  1032. Lat/Long Parser
  1033. Laxative Shot Roulette
  1034. Lazy Chain
  1035. Lazy evaluation
  1036. Left$ and Right$
  1037. Let's Play Darts!
  1038. Lexicographic Permutations
  1039. Life without primes
  1040. Limit string length - 1
  1041. Line Segments Intersection Point
  1042. Line, Normalization
  1043. Linear Equation Solver
  1044. Linear Regression of Y on X
  1045. Link Up--Play game Series #7
  1046. Linux history and ! command. Series#1 The !! command
  1047. Linux history and ! command. Series#2 The !n command
  1048. Linux history and ! command. Series#3 The !-n command
  1049. Linux history and ! command. Series#4 The !string command
  1050. Linux history and ! command. Series#5 The !?string command
  1051. List Comprehensions
  1052. Lists and Objects - Top Trump Optimizer
  1053. Live and Let Dice ...roll
  1054. Live Chess Ratings
  1055. Localize The Barycenter of a Triangle
  1056. Logic Calculator - Puzzles #3
  1057. Logical Disjunctions
  1058. Logistic Map
  1059. Long Division
  1060. Longest Consecutive Sequence of Squares
  1061. Longest palindrome
  1062. Longest Word in Dictionary
  1063. Loose Change
  1064. Loose Change!
  1065. Lost number in number sequence
  1066. Lottery machine
  1067. Lowercase strings in array
  1068. Lowest product of 4 consecutive numbers
  1069. LRU Cache
  1070. Lucas numbers
  1071. Lucas-Lehmer Test for Mersenne Primes
  1072. Lucky Sevens
  1073. Lychrel numbers
  1074. LZW Compression - Squeeze that data!
  1075. LZW Compression (and decompression)
  1076. Mad Max: Recursion Road
  1077. Madhav array
  1078. Magic Square Validator
  1079. Magic The Gathering #2: Mana
  1080. Magic The Gathering #3: Spell Stack
  1081. Mahjong - #2 Seven-pairs
  1082. Mahjong - #3 How far from winning
  1083. Mahjong - #4 Play with imagination!
  1084. Mahjong winning hand Validation #1: DA SI XI(大四喜)
  1085. Mahjong winning hand Validation #2: DA SAN YUAN(大三元)
  1086. Mahjong winning hand Validation #4: JIU LIAN BAO DENG(九莲宝灯)
  1087. Mahjong winning hand Validation #5: YI SE SI BU GAO(一色四步高)
  1088. Make a 1 to n sequence
  1089. Make a Palindrome
  1090. Make a square box!
  1091. Make Object Into Iterable Array
  1092. Make the Deadfish Swim
  1093. Make the small words big!
  1094. Making Change
  1095. Making Change: Part 2
  1096. Making Copies
  1097. Making squares with lines
  1098. Man in the west
  1099. Manage the Robot Factory: Day 1
  1100. Manipulate URL Parameters
  1101. Many Maps As One
  1102. Map and Filter to Get a Special Sequence of Integers
  1103. Map function issue
  1104. Marching armies
  1105. Markings to White Triangles and How to Find Them
  1106. Masquerade Waiting Line
  1107. Master your primes: sieve with memoization
  1108. Math Issues
  1109. Math Object Madness
  1110. Matrix creation
  1111. Matrix Multiplier
  1112. Matrix Rotation
  1113. Matrix Square Up, B!
  1114. Max number of people and year in a specific place
  1115. Max-min arrays
  1116. Maxed Out
  1117. Maximum Product of Parts
  1118. Maximum Product
  1119. Maya Number Converter
  1120. Memesorting
  1121. Memoized Log Cutting
  1122. Memory Reallocation
  1123. Merge two arrays
  1124. MergeSort "merge" function
  1125. Message from Aliens
  1126. Meta-Kata: Duplicate Detector v0.1
  1127. Metaprogramming: Lisp-style Generic Functions
  1128. Mid-Endian numbers
  1129. Midpoint inception
  1130. Midtown Navigator
  1131. Miles per gallon to kilometers per liter
  1132. Milliseconds
  1133. Min or Max of . . .
  1134. Mind the Gap
  1135. Mine Sweeper
  1136. Minimum dollar bill's count
  1137. Minimum Number of Coins
  1138. Minimum path in squares
  1139. Minimum Reduction
  1140. Minimum Steps (Array Series #6)
  1141. Minimum unfairness of a list/array
  1142. Miracle Sort
  1143. Missing Alphabet
  1144. Missing Angle
  1145. Missing number in Unordered Arithmetic Progression
  1146. Mission: Hidden Message
  1147. Mixbonacci
  1148. mkdir -p
  1149. Mnemo Passwords : pwgen
  1150. Mnemonic Lookup
  1151. Modulo operations of big Numbers
  1152. Monads: The Maybe Monad
  1153. Monads: The list monad
  1154. Money Match: Double or Nothing
  1155. Mongodb ObjectID
  1156. Monkey Talk
  1157. Monkey Tennis - The Aftermath
  1158. Monkey's MATH 01: How many "ZERO"s?
  1159. MONTE CARLO 3D
  1160. month name story
  1161. Months, Weeks, Days, Hours and Minutes
  1162. Most Consecutive Zeros of a Binary Number
  1163. Most frequently used words in a text
  1164. Mount Events in ReactJS
  1165. Moves in squared strings (I)
  1166. Moves in squared strings (II)
  1167. Moves in squared strings (III)
  1168. Moves in squared strings (IV)
  1169. MTV Cribs
  1170. Multi Line Task: Fizz Buzz
  1171. Multi Line Task: GCD Function
  1172. Multi Line Task++: Hello World
  1173. Multi Line Task∞: Hello World
  1174. Multiple implications
  1175. Multiple remainder of the division
  1176. Multiples by permutations
  1177. Multiples By Permutations II
  1178. Multiples of 3 and 5 redux
  1179. Multiplication - Generators #2
  1180. Multiplicative Persistence... What's special about 277777788888899?
  1181. Multiply list by integer (with restrictions)
  1182. Multiply the number
  1183. Multiply Word in String
  1184. multiply(value, times)
  1185. Mutate My Strings
  1186. Mutual Recursion
  1187. myjinxin katas #001 : Rotate, Remove, Return
  1188. myjinxin katas #002 : Hotel room number
  1189. myjinxin katas #003 : Crossword puzzle
  1190. myjinxin katas #004 : Soldier's queue training(easy version)
  1191. myjinxin katas #005 : Age Of Wind
  1192. myjinxin's Fairy tales #001 : Aladdin's lamp and three wishes
  1193. myjinxin's Fairy tales #002 : Ali Baba and the Forty Thieves I
  1194. myjinxin's Fairy tales #003 : Ali Baba and the Forty Thieves II
  1195. myjinxin's Fairy tales #004 : Ali Baba and the Forty Thieves III
  1196. myjinxin's Fairy tales #005 : The little match girl
  1197. Mystery Function
  1198. Mystery function #1
  1199. Mystery function #2
  1200. N High Scores
  1201. N smallest elements in original order
  1202. n-Bonacci Ratio
  1203. N-centered Array
  1204. N-Parasitic Numbers Ending in N
  1205. N00bify - English to n00b Translator
  1206. Name Array Capping
  1207. Name on billboard
  1208. Name That Integer
  1209. Name to Matrix
  1210. Natas Recipes
  1211. NATO Phonetic Alphabet
  1212. Natural Log Approximator
  1213. Naughty or Nice?
  1214. Needles in a haystack
  1215. Negation of a Value
  1216. Nesting Structure Comparison
  1217. new Deck() of Cards
  1218. new IntStorage(byteLength, ints).read(from, count);
  1219. new IntStorage(byteLength).write(value, length)
  1220. new with apply
  1221. Next Featured Number Higher than a Given Value
  1222. Next Largest Value (by rearranging the last digit and the last by one if neccessary)
  1223. Next Palindromic Number.
  1224. Next smaller number with the same digits
  1225. Nickname Generator
  1226. NIM the game
  1227. Ninety Nine Thousand Nine Hundred Ninety Nine
  1228. Ninja vs Samurai: Strike
  1229. No Loops 1 - Small enough?
  1230. No Loops 2 - You only need one
  1231. No Return #2: Test the Devices
  1232. No Return #3: Solve the Equation
  1233. Node.js Async I/O
  1234. Non Decomposable Primes as Sums of Perfect Squares
  1235. Non-even substrings
  1236. None shall pass
  1237. noobCode 03: CHECK THESE LETTERS... see if letters in "String 2" are present in "String 1"
  1238. noobCode 04: HOT SINGLES...compare two arrays, return the unpaired items !
  1239. Normal number
  1240. Normalizing Out of Range Array Indexes
  1241. Not all but sometimes all
  1242. Not prime numbers
  1243. Not Quine
  1244. Not so black box
  1245. Not that obvious summation
  1246. Not very secure
  1247. Now that's a crib!
  1248. Noye's Fludde
  1249. NSA Phone Tapping
  1250. NSA's Little Puzzle
  1251. nth Floyd line
  1252. Nth Smallest Element (Array Series #4)
  1253. Nth term - Linear Sequences
  1254. Nuclear Missile Manager
  1255. Number , number ... wait LETTER !
  1256. Number climber
  1257. Number Decoding
  1258. Number Manipulation I (Easy)
  1259. Number of anagrams in an array of words
  1260. Number of Folds
  1261. Number of measurements to spot the counterfeit coin
  1262. Number of Palindromic Substrings
  1263. Number of Proper Fractions with Denominator d
  1264. Number Shortening Filter
  1265. number with 3 roots.
  1266. Number-like counter
  1267. Number-Star ladder
  1268. Number.prototype.toDecimal
  1269. Numbers and its Reversal Having Same Prime Factors.
  1270. Numbers in different systems
  1271. Numbers in strings
  1272. Numbers that are a power of their sum of digits
  1273. Numbers Which Sum of Powers of Its Digits Is The Same Number
  1274. Numbers' Plus Pattern
  1275. Numerical Palindrome #2
  1276. Numerical Palindrome #3
  1277. Numerical Palindrome #3.5
  1278. Numerical Palindrome #4
  1279. Numerology
  1280. NxN Connect X
  1281. Obfuscation confusion - Bug Fixing #10
  1282. Object to Array
  1283. object to xml - xml #2
  1284. Objectify all the strings
  1285. Odd Not Prime
  1286. Odd-heavy Array
  1287. Odds-Index
  1288. Offload your work!
  1289. Offspring Traits
  1290. Oh come on! Hello world! once again?
  1291. Oh dear God! Is it bugged?
  1292. Oktober Fest: Bjorg's Got A Drinking Problem
  1293. Old Greg's Binary Fingers
  1294. Once
  1295. One down
  1296. One graph or multiple ones ?
  1297. One Line : Bit Calculator
  1298. One line kata: Sum Multiples of 3 and 5
  1299. One Line Task: 'for' fun
  1300. One Line Task: Diamond Creator Pro
  1301. One Line Task: Making Pizza
  1302. One line task: Multiples of 3 and 5
  1303. One Line Task: Paint The Walls Of Office
  1304. One line task: Square a number Without *, + or Math.pow()
  1305. One line task: Square Every Digit
  1306. One Line Task: String Isomorphism
  1307. One Line Task: The Special Downward Step
  1308. One Line Wonder: Sum All Even Fibonacci Numbers
  1309. One Line: Even Check
  1310. One Variable Second Degree Equation Solver
  1311. Ones' Complement
  1312. Onion array
  1313. Ookkk, Ok, O? Ook, Ok, Ooo!
  1314. Operation - Steal the Election!
  1315. Optimum coding school location
  1316. Oracle: Coin Method
  1317. Ordinal Numbers
  1318. Ore Numbers
  1319. Organise duplicate numbers in list
  1320. ORing arrays
  1321. Orthogonal Vectors
  1322. Pack the box.
  1323. PaginationHelper
  1324. Palindrome for your Dome
  1325. Palindrome integer composition
  1326. Palindromes with a slight twist: vowels & consonants assessed separately
  1327. Palindromic Mnemonics
  1328. Paragraph Setting: Align Left
  1329. Parallel resistors
  1330. Parity bit - Error detecting code
  1331. Parse a linked list from a string
  1332. Parse all my XML please - Angular #1
  1333. Parse HTML/CSS Colors
  1334. Parse this function! - Puzzles #7
  1335. Parsing musical notes into MIDI
  1336. Partial Word Searching
  1337. Partially equal objects
  1338. Partition On
  1339. Path Finder #2: shortest path
  1340. Path Finder #3: the Alpinist
  1341. Path Finder #4: where are you?
  1342. Path Finder #5: there's someone here
  1343. Paths in the Grid
  1344. Paul Cipher & Kevin Arnold
  1345. PC upgrade specs using HOC in ReactJS
  1346. Peak array index
  1347. Peel the Pairs
  1348. Pentabonacci
  1349. Percentage of amino acids
  1350. Perfect Square.
  1351. Permutation position
  1352. Permutation Average
  1353. Permutation by number
  1354. Permutational Primes
  1355. Permutations - Generators #4
  1356. Permutations Of An Array And Associated Values
  1357. Permute a Palindrome
  1358. Personalising Spammy Marketing Emails
  1359. Personalized brand list
  1360. Physics - Mechanics - Atwood Machines in Series
  1361. Piano Kata, Part 1
  1362. Piano Kata, Part 2
  1363. pick a set of first elements
  1364. Pig Sursurunga
  1365. Pillow on the Fridge
  1366. Ping-Pong service problem
  1367. Pinocchio's polygraph.
  1368. Pitches and Notes
  1369. Pizza Payments
  1370. Plants and Zombies
  1371. Play FlappyBird : Advance Bravely
  1372. Play PacMan : Devour all
  1373. Play PingPong : Precise control
  1374. Play Tetris : Shape anastomosis
  1375. Player Contact Manager
  1376. Player Methods - Dungeon crawler #2
  1377. Playing with Sets : Complement
  1378. Playing with Sets : Equal or Not ?
  1379. Playing with Sets : Intersection
  1380. Playing with Sets : Sup/Sub
  1381. Playing with types
  1382. Plenty of Fish in the Pond
  1383. Plus - minus - plus - plus - ... - Count
  1384. Plus - minus - plus - plus - ... - Sum
  1385. Podcast Speed Listening Calculator
  1386. Pokemon Go
  1387. Pokemon Go - Extended Edition
  1388. PokerHelper lvl. 1
  1389. Pole Vault Starting Marks
  1390. Polish alphabet
  1391. Polygon Orientation
  1392. Poor man's spreadsheet API
  1393. Portion of Array
  1394. Possibilities of throwing a coin n times
  1395. Possible Triangles Formed with Available Iron Rods
  1396. Potenciation
  1397. Potion Class 101
  1398. Power
  1399. Power .bind()
  1400. Power 2
  1401. Power Laws
  1402. Powers of 3
  1403. Powers of i
  1404. Practical Interview Prep: Binary Search Tree .push()
  1405. Pre-FizzBuzz Workout #1
  1406. Prefix Permutation
  1407. Presentation order
  1408. Preserve the order !
  1409. Pretty date
  1410. Price is right
  1411. Price of Mangoes
  1412. Prime reduction
  1413. Prime reversion
  1414. Prime Word
  1415. Primes in numbers
  1416. Primitive Pythagorean Triples
  1417. Primorial Of a Number
  1418. Print a Rectangle Using Asterisks
  1419. Print count and numbers
  1420. Print number with character
  1421. PRNG: Linear Congruential Generator
  1422. Process Waterfowl Survey Data Results
  1423. Product ID from URL
  1424. Product of Adjacent Grid Numbers
  1425. Product of consecutive Fib numbers
  1426. Product Of Maximums Of Array (Array Series #2)
  1427. Product of the main diagonal of a square matrix.
  1428. Product-Sum Numbers
  1429. Program a Calculator #1 - Points in 3D Space
  1430. Program a Calculator #2 - 3D Vectors
  1431. Progressive Spiral Number Branch
  1432. Progressive Spiral Number Distance
  1433. Progressive Spiral Number Position
  1434. Promises Made and Broken: The Misadventures of Bob the Highly Paid Consultant
  1435. Protein Synthesis: From DNA to Polypeptide
  1436. Puzzle Fighter
  1437. Pythagorean Triplets
  1438. PythonSlice
  1439. Quadratic Enumerator
  1440. Quantum Bogosort
  1441. Quartile methods
  1442. Queue Battle
  1443. Queue time counter
  1444. Quick (n choose k) calculator
  1445. Quicksum
  1446. Quidditch Scoreboard
  1447. Quipu Calculator
  1448. Random case
  1449. Randomize Objects
  1450. Range function
  1451. Range of Integers in an Unsorted String
  1452. Ranking Appointments
  1453. Ranking System
  1454. Rap-Name Generator
  1455. Ratio of Bouncy Numbers
  1456. Reach Me and Sum my Digits
  1457. React Fun #1: Component types and nesting
  1458. React with JSX
  1459. Read the time
  1460. Readability is King
  1461. Readable developer-friendly large numbers
  1462. Really Complex Sum
  1463. Recurrence by Recursion
  1464. Recursion 101
  1465. Recursion #1 - Factorial
  1466. Recursion #2 - Fibonacci
  1467. Recursion: An introduction
  1468. Recursive Averages
  1469. Recursive Floor Sequence
  1470. Recursive Ninja
  1471. Recursive Ninja: Warlords edition
  1472. Reducing Problems - Bug Fixing #8
  1473. Refactored Greeting
  1474. Regular Expression for Binary Numbers Divisible by n
  1475. Reimplement Multiplication Part 1
  1476. Relatively Prime Numbers
  1477. Remember
  1478. Remove a Specific Element of an Array
  1479. Remove All The Marked Elements of a List
  1480. Remove duplication
  1481. Remove First and Last Character Part Two
  1482. Remove Zeros
  1483. ReOrdering
  1484. Replace Noun Phrases with Pronouns
  1485. Represent array of numbers as ranges
  1486. Retrieve Ether Balance
  1487. Return a sorted list of objects
  1488. Return Specifics from an Object.
  1489. Return String of First Characters
  1490. Return the first M multiples of N
  1491. Return TIMESTAMP from date
  1492. Reverse a Number
  1493. Reverse DNS delegation (RFC4183)
  1494. Reverse every other word in the string
  1495. Reversed Message
  1496. reverseIt
  1497. Reverser
  1498. Reversi row rudiments
  1499. Rithm Series: Frame a Phrase Simple
  1500. Roasting Chicken
  1501. Robbing Rövarspråket
  1502. RoboScript #5 - The Final Obstacle (Implement RSU)
  1503. Robotic Tattoo Removal
  1504. Rock Paper Scissors Oracle
  1505. Roman numerals converter and validator
  1506. Romanize Russian Road Signs
  1507. ROT13 variant cipher
  1508. Rotate Array (JS)
  1509. Rotate Corners
  1510. Rotate matrix counter - clockwise N - times!
  1511. Rotated string
  1512. Rotation Cipher Cracker
  1513. Round by 0.5 steps
  1514. Round to nearest 0 or 5
  1515. Route Calculator
  1516. Routes in a square grid
  1517. Running out of space
  1518. RuplesJS #1: N Times Do
  1519. RuplesJS #2: String Delete
  1520. RuplesJS #3: String EachChar
  1521. RuplesJS #4: String Formatting
  1522. RuplesJS #5: Range
  1523. Russian plurals
  1524. Russian postal code checker
  1525. Saint Petersburg Paradox Model
  1526. Same Birthday Probability
  1527. Santa wish list form in ReactJS
  1528. SantaClausable Interface
  1529. Satisfying numbers
  1530. Save Private Brain
  1531. Scaling Squared Strings
  1532. Scheduling (Round-Robin)
  1533. Scheduling (Shortest Job First or SJF)
  1534. Schrödinger's Boolean
  1535. Scooby Doo Puzzle
  1536. Scrambled Numbers Sorting
  1537. Scraping: Codewars Top 500 Users
  1538. Screen Locking Patterns
  1539. Scrolling Text
  1540. Search and sort names
  1541. search in multidimensional array
  1542. Seating arrangement at a Polyglot Summit
  1543. Secret Agent 101: The secret password
  1544. Secret knock
  1545. Secret Message
  1546. Secret Reverse Language Converter
  1547. See You Next Happy Year
  1548. Seeing Shows at the Edinburgh Fringe!
  1549. Selective Array Reversing
  1550. Selective fear of numbers
  1551. self_converge
  1552. Semi-Optional
  1553. Sentence Calculator
  1554. Sentences with Functions
  1555. Separate The Wheat From The Chaff
  1556. Separating Strings
  1557. Sequence convergence
  1558. Sequence to 1
  1559. Series Forensics
  1560. Set - the card game
  1561. Seventh JSON of a seventh JSON
  1562. Sexy Primes <3
  1563. Shakespearean Tug of War
  1564. Share prices
  1565. Sharpen up
  1566. Shop Inventory Manager
  1567. Shorten Me: Array Declaration III (Fibonacci Last Digit)
  1568. Shorten Me: Array Declaration IV (1-30)
  1569. Shorten Me: Array Declaration IX (Variable Types)
  1570. Shorten Me: Array Declaration V (Weekday & Weekend)
  1571. Shorten Me: Array Declaration VI (Months)
  1572. Shorten Me: Array Declaration VII (Alphabets)
  1573. Shorten Me: Array Declaration VIII (Musical Scales)
  1574. Shorten Me: Array Declaration X (O-I-II)
  1575. Shorten Me: Array Declaration XI (Triangle)
  1576. Shorten Me: Array Declaration XII (Constants)
  1577. Shorten Me: Mad Mathematician's Algorithm VI (Power)
  1578. shorter concat [reverse longer]
  1579. Shortest Code : Are they symmetrical?
  1580. Shortest code : Balance Attraction
  1581. Shortest Code : Eat watermelon
  1582. Shortest Code : Find the murderer
  1583. Shortest Code : Guess the Hat
  1584. Shortest Code : Jumping Dutch act
  1585. Shortest Code : Planting Trees
  1586. Shortest Code : Reading a Book
  1587. Shortest Code : Regular expression compression
  1588. Shortest Code : Remove screws I
  1589. Shortest Code : Special factor
  1590. Shortest code : Tidy up the room
  1591. Shortest Code : Waiting for a Bus
  1592. Shortest code: Bug in Apple
  1593. Shortest Code: Collatz Array(Split or merge)
  1594. Shortest code: Father and Son
  1595. Shortest code: Give me the equation
  1596. Shortest code: Max Value
  1597. Shortest Code: Symmetric Sort
  1598. Shortest Code: Trypophobia
  1599. Shortest code: Virus in Apple
  1600. Shortest Knight Path
  1601. Shortest steps to a number
  1602. Shrink the maze!
  1603. SillyCASE
  1604. Simple division
  1605. Simple arithmetic progression
  1606. Simple array product
  1607. Simple Blackjack
  1608. Simple Change Machine
  1609. Simple Comparison?
  1610. Simple consecutive pairs
  1611. Simple digit code breaker
  1612. Simple directions reversal
  1613. Simple equation reversal
  1614. Simple Events
  1615. Simple eviternity numbers
  1616. Simple fibonacci strings
  1617. Simple fraction to mixed number converter
  1618. Simple frequency sort
  1619. Simple Fun #364: Not Too Random
  1620. Simple Fun #365: Remove Number Game I
  1621. Simple Fun #377: The Visible Posters II
  1622. Simple Interest and Compound Interest
  1623. Simple letter removal
  1624. Simple Maths Test
  1625. Simple max digit sum
  1626. Simple Memory Manager
  1627. Simple missing sum
  1628. Simple nearest prime
  1629. Simple non-decreasing array
  1630. Simple number sequence
  1631. Simple palindrome game
  1632. Simple parenthesis removal
  1633. Simple Physics Problem
  1634. Simple prime streaming
  1635. Simple repeated words
  1636. Simple reversal game
  1637. Simple reversed parenthesis
  1638. Simple rotated palindromes
  1639. Simple Ruby code formatter
  1640. Simple safecracking
  1641. Simple Simple Simple String Expansion
  1642. Simple string characters
  1643. Simple string division
  1644. Simple string division II
  1645. Simple string expansion
  1646. Simple string indices
  1647. Simple string matching
  1648. Simple string reversal
  1649. Simple string reversal II
  1650. Simple Substitution Cipher Helper
  1651. Simple sum of pairs
  1652. Simple template
  1653. Simple Time Bomb
  1654. Simple time difference
  1655. Simple Web Framework #1: Create a basic router
  1656. simpleLog
  1657. Simplify the number!
  1658. Simplifying multilinear polynomials
  1659. Simulating a Multiserver Queue
  1660. Simultaneous Equations - Three Variables
  1661. Single character palindromes
  1662. Single character palindromes II
  1663. Single-Use Tickets: Don't Let Anyone Sneak In!
  1664. Singleton Pattern
  1665. Sir , showMe yourID
  1666. Slamming Lockers
  1667. sliceBits(int, from, count)
  1668. Sliding Puzzle Solver
  1669. Smallest possible sum
  1670. Smart Sum
  1671. Smart Toaster
  1672. Smith number
  1673. SMS Lottery Bet Validator
  1674. SMS Shortener
  1675. Soccer Fixtures Results Table
  1676. Socialist distribution
  1677. Solomon's Quest for the Temporal Crystal
  1678. Solve For X
  1679. solve from sums
  1680. Solve Rubik 's Cube by repetition
  1681. Solving Quadratics
  1682. Some Circles
  1683. Something 's fishy...
  1684. Sort and Transform
  1685. sort array by last character
  1686. Sort it out!
  1687. Sort rectangles and circles by area
  1688. Sort the climbing grades
  1689. Sort the Gift Code
  1690. Sort the Vowels!
  1691. Sorted list
  1692. Sorting Arrays by the Amount of Perfect Squares that Each Element May Generate
  1693. Sorting the Rabbit Hole
  1694. Sorting Time
  1695. Space Invaders Underdog
  1696. Spanish Conjugator
  1697. Spanish Pirates off the Treasure Coast
  1698. Sparse Ruler
  1699. Sparse array split function
  1700. Special Number (Special Numbers Series #5)
  1701. Special Multiples
  1702. Speech to Text - String Manipulation
  1703. SpeedCode #1 - Getters and Setters in Object Literals
  1704. SpeedCode #2 - Array Madness
  1705. SpeedCode #3 × Fun with ES6 Classes #5 - Dogs and Classes
  1706. SpeedCode #4 × Factory Functions #3 - Artefacts
  1707. Spider man and his enemy
  1708. Spidey Swings Across Town
  1709. Spinning Rings
  1710. Split an array
  1711. Split and then add both sides of an array together.
  1712. Split In Parts
  1713. Split string for Text-to-Speech API
  1714. Split The Bill
  1715. Sports league table - help your local team!
  1716. Spraying trees
  1717. Spy Function
  1718. Square sums (simple)
  1719. Squarefree Part of a Number
  1720. Squares sequence
  1721. Stack Safe Recursion
  1722. Stargate SG-1: Cute and Fuzzy (Improved version)
  1723. Statistics - Fundamentals
  1724. Statistics for an Athletic Association
  1725. Steer the Ship
  1726. Steps in k-primes
  1727. Steven's Password Decryption
  1728. Stock Position Size Calculator
  1729. Stone bridge primes
  1730. Stop it, HTML!
  1731. Strange roman numbers
  1732. String array duplicates
  1733. String like [Char]
  1734. String basics
  1735. String Box
  1736. String Breakers
  1737. String character frequency
  1738. String chunks
  1739. String Compression Challenge
  1740. String counting
  1741. String doubles
  1742. String Evaluation
  1743. String formatter
  1744. String Integer Greater-than
  1745. String matchup
  1746. String Merge!
  1747. String reduction
  1748. String Reordering
  1749. String Scramble
  1750. String subpattern recognition I
  1751. String subpattern recognition II
  1752. String subpattern recognition III
  1753. Strings, strings, strings (Easy)
  1754. Strings, strings, strings (Hard)
  1755. Stutter function
  1756. Sub-array division
  1757. Subnet Calculating
  1758. Sum #2
  1759. Sum decomposition
  1760. Sum of (Two) Squares
  1761. Sum of a Sequence [Hard-Core Version]
  1762. Sum of all arguments
  1763. Sum of array singles
  1764. Sum of differences between products and LCMs
  1765. Sum of differences in array
  1766. Sum of integer combinations
  1767. Sum of integers in string
  1768. Sum of prime-indexed elements
  1769. Sum Only Numbers
  1770. Sum The Strings: ARRAY EDITION
  1771. Sum up the random string
  1772. sum2total
  1773. Summarize ranges
  1774. Summy
  1775. Super Class Extensions
  1776. Super Smaaassh Brotheerrrs!
  1777. Superphore Master
  1778. Surface Area and Volume of a Trapezoidal Prism
  1779. Sushi-go-round (Beginner's)
  1780. Swap the head and the tail
  1781. Swap two elements
  1782. Swap two numbers
  1783. Swarm bots - swarm intelligence #1
  1784. Swedish Tipping
  1785. Sweet Dreams are Made of Cheese
  1786. Switch/Case - Bug Fixing #6
  1787. Symbolic differentiation of prefix expressions
  1788. Symbols counted
  1789. Synchonizing records
  1790. T.T.T. #7: Profit or loss
  1791. T.T.T. #8: Reverse all
  1792. T.T.T. #9: Peaks and valleys
  1793. T.T.T.#2: Equal to 24
  1794. T.T.T.#3: Three lifts
  1795. T.T.T.#4: Key of door
  1796. T.T.T.#5: Only you
  1797. T.T.T.#6: nth user
  1798. T.T.T.10: The largest square
  1799. T.T.T.11: Three increasing numbers
  1800. T.T.T.12: Split integer
  1801. T.T.T.13: A game named "Five,Ten,Fifteen,Twenty"
  1802. T.T.T.14: Find the largest "X"
  1803. T.T.T.15: Sort the alarm clock
  1804. T.T.T.16: Warning of Array.map()
  1805. T.T.T.23: Silly birds
  1806. T.T.T.24: Chinese surname (《百家姓》)
  1807. T.T.T.33: Grandfather clock
  1808. T.T.T.38: The sum of each digits
  1809. T.T.T.40: m to n % 9
  1810. T.T.T.41: The maximum profit
  1811. T.T.T.43: The appellation of the Chinese people's age and his zodiac(中国人的年龄和他的生肖称谓)
  1812. T.T.T.58: Simple face recognition system
  1813. T.T.T.59: The language from the distant planet
  1814. T.T.T.60: Break all the rules
  1815. T.T.T.61: Alien's magic
  1816. Tabs to spaces
  1817. Tail Call Optimization
  1818. Take an Arrow to the knee, Functionally
  1819. Take It or Leave It Interview Strategy
  1820. Take the Derivative
  1821. Takeshi's Castle Spy: Knock Knock
  1822. Talisman Board Game Combat System Checker
  1823. Tank coding #1 : simple AIM systems
  1824. Tap Into Mr. Mxyzinjin's Brain
  1825. Tap Into Mr. Mxyzinjin's Matrix
  1826. Tap Into Mr. Mxyzinjin's Safe
  1827. Tap into Mr. Mxyzinjin's Stream
  1828. Tap Into Mr. Mxyzinjin's Toy Safe
  1829. Tap into Reivhax's robot
  1830. Temp Tracker: Max, Min, Mean and Mode
  1831. Template Strings
  1832. Test for semiprime (Mathematics)
  1833. Test Your Knowledge Of Function Scope
  1834. Test's results
  1835. Testing the Porges hypothesis
  1836. Texas Hold'em Hands
  1837. Text editor feature!
  1838. The 'if' function
  1839. The (nearly) Perfect Mirror
  1840. The 196-algorithm and Lychrel numbers
  1841. The answer to life the universe and everything.
  1842. The Answer to the Ultimate Question of Life, The Universe, and Everything
  1843. The Arpeggiator
  1844. The average length
  1845. The Baby Years III - First Tooth
  1846. The boolean order
  1847. The common directory path
  1848. The Coupon Code
  1849. The Cube Structure
  1850. The Deca Tree
  1851. The Desperate Rocket Scientist
  1852. The Enigma Machine - Part 1: The Plugboard
  1853. The fusc function -- Part 1
  1854. The fusc function -- Part 2
  1855. The good old olden early years
  1856. the hidden thief
  1857. The Ice Cream Vendors Dilema
  1858. The Ladies of ENIAC
  1859. The largest "mirror"
  1860. The learning game - Machine Learning #1
  1861. The longest bracket substring in the string
  1862. The map and the keys
  1863. The maximum sum value of ranges -- Ultimate version
  1864. The money in the bank
  1865. The most asked question on CodeWars
  1866. The Most Repeated Letter.
  1867. The Most Sacred of Days
  1868. The observed PIN
  1869. The Office II - Boredom Score
  1870. The old switcheroo
  1871. The old switcheroo 2
  1872. The Overlap Time
  1873. The Owls Are Not What They Seem
  1874. The Power of Exponents
  1875. The Prediction
  1876. The Queen Of Hearts Challenge
  1877. The queen on the chessboard
  1878. The rarest pepe
  1879. The Rhinestone Cowboy ~ Count the dollars in his boots!
  1880. The sortReloaded() method
  1881. The Sum and The Rest of Certain Pairs of Numbers have to be Perfect Squares (more Challenging)
  1882. The Supermarket Queue
  1883. The ugly truth about reduce
  1884. The ugly truth about reduce (ii)
  1885. The ugly truth about reduce (iii)
  1886. The Walker
  1887. There are two kinds of people
  1888. They say that only the name is long enough to attract attention. They also said that only a simple Kata will have someone to solve it. This is a sadly story #1: Are they opposite?
  1889. Thinkful - Logic Drills: Red and bumpy
  1890. Thinkful - Number Drills: Blue and red marbles
  1891. Thinkful - Object Drills: Vectors
  1892. Thinking & Testing #38: What's the "?"
  1893. Thinking & Testing : Archery contest
  1894. Thinking & Testing : A happy day will come
  1895. Thinking & Testing : Digital swimming pool
  1896. Thinking & Testing : Falsetto Rap Concert
  1897. Thinking & Testing : From nothingness To nothingness
  1898. Thinking & Testing : Hail and Waterfall
  1899. Thinking & Testing : How many "word"?
  1900. Thinking & Testing : How many blocks?
  1901. Thinking & Testing : I hate big and small
  1902. Thinking & Testing : Incomplete string
  1903. Thinking & Testing : Love Forever
  1904. Thinking & Testing : Math of Middle school
  1905. Thinking & Testing : Math of Primary School
  1906. Thinking & Testing : Nebula or Vortex
  1907. Thinking & Testing : Not perfect? Throw away!
  1908. Thinking & Testing : Operator hidden in a string
  1909. Thinking & Testing : Report about something
  1910. Thinking & Testing : Retention and discard
  1911. Thinking & Testing : Retention and discard II
  1912. Thinking & Testing : Safe position
  1913. Thinking & Testing : Something capitalized
  1914. Thinking & Testing : Spatiotemporal index
  1915. Thinking & Testing : Sport Star
  1916. Thinking & Testing : Substring Magic
  1917. Thinking & Testing : Sum of 15(Hetu Luosliu)
  1918. Thinking & Testing : The repair of parchment
  1919. Thinking & Testing : True or False
  1920. Thinking & Testing : Uniq or not Uniq
  1921. Thinking & Testing : Who are you?
  1922. Thinking & Testing : Wind whispers
  1923. Thinking & Testing: A and B?
  1924. This isn't what you think! The Misadventures of Bob the Highly Paid Consultant #2
  1925. THIS n' THAT
  1926. Three added Characters
  1927. Three Dots--Play game Series #8
  1928. Throw from list - Error Handling #3
  1929. Thue-Morse Sequence
  1930. Tic-Tac-Toe Checker
  1931. Tic-Tac-Toe-like table Generator
  1932. Ticker
  1933. Tidy Number (Special Numbers Series #9)
  1934. Time Conversion: 12s and 24s
  1935. Time Converter: hours, minutes, seconds and milliseconds
  1936. Time Degrees
  1937. Time Simulation
  1938. Timers
  1939. To BrainFuck Transpiler
  1940. toHonestlyFixed()
  1941. ToLeetSpeak
  1942. Tom's Allergies
  1943. Tombola - validation
  1944. Total Resistance in a Parallel Circuit
  1945. Touching Rectangles
  1946. Tower Defense: Risk Analysis
  1947. Track the Ball
  1948. Tracking Hits for Different Sum Values for Different Kinds of Dice
  1949. Tracking Sums in a Process
  1950. Train to remove duplicates from an array with filter()
  1951. Training JS #1: create your first JS function and print "Hello World!"
  1952. Training JS #10: loop statement --for
  1953. Training JS #11: loop statement --break,continue
  1954. Training JS #12: loop statement --for..in and for..of
  1955. Training JS #13: Number object and its properties
  1956. Training JS #14: Methods of Number object--toString() and toLocaleString()
  1957. Training JS #15: Methods of Number object--toFixed(), toExponential() and toPrecision()
  1958. Training JS #16: Methods of String object--slice(), substring() and substr()
  1959. Training JS #17: Methods of String object--indexOf(), lastIndexOf() and search()
  1960. Training JS #18: Methods of String object--concat() split() and its good friend join()
  1961. Training JS #19: Methods of String object--toUpperCase() toLowerCase() and replace()
  1962. Training JS #2: Basic data types--Number
  1963. Training JS #20: Methods of String object--charAt() charCodeAt() and fromCharCode()
  1964. Training JS #21: Methods of String object--trim() and the string template
  1965. Training JS #22: Unlock new skills--Arrow function,spread operator and deconstruction
  1966. Training JS #23: methods of arrayObject---push(), pop(), shift() and unshift()
  1967. Training JS #24: methods of arrayObject---splice() and slice()
  1968. Training JS #25: methods of arrayObject---reverse() and sort()
  1969. Training JS #26: methods of arrayObject---map()
  1970. Training JS #27: methods of arrayObject---filter()
  1971. Training JS #28: methods of arrayObject---every() and some()
  1972. Training JS #29: methods of arrayObject---concat() and join()
  1973. Training JS #3: Basic data types--String
  1974. Training JS #30: methods of arrayObject---reduce() and reduceRight()
  1975. Training JS #31: methods of arrayObject---isArray() indexOf() and toString()
  1976. Training JS #32: methods of Math---round() ceil() and floor()
  1977. Training JS #33: methods of Math---max() min() and abs()
  1978. Training JS #35: methods of Math---log() and its family
  1979. Training JS #36: methods of Math---kata author's lover:random()
  1980. Training JS #37: Unlock new weapon---RegExp Object
  1981. Training JS #38: Regular Expression--"^","$", "." and test()
  1982. Training JS #39: Regular Expression--"?", "*", "+" and "{}"
  1983. Training JS #4: Basic data types--Array
  1984. Training JS #40: Regular Expression--"|", "[]" and "()"
  1985. Training JS #41: Regular Expression--""
  1986. Training JS #42: Regular Expression--( ?: ), ( ?= ) and ( ?! )
  1987. Training JS #5: Basic data types--Object
  1988. Training JS #6: Basic data types--Boolean and conditional statements if..else
  1989. Training JS #7: if..else and ternary operator
  1990. Training JS #8: Conditional statement--switch
  1991. Training JS #9: loop statement --while and do..while
  1992. Training Random Testcases #2: Palindrome string
  1993. Tram Capacity
  1994. Transform To Prime
  1995. Transforming Maze Solver
  1996. Translate DNA in 6 frames
  1997. Transpose of a Matrix
  1998. Traverse array elements diagonally
  1999. Treasure Box
  2000. Tree Depth
  2001. Tree Directory
  2002. Triangle Line Task: Fizz Buzz
  2003. Triangle of Multiples (Easy One)
  2004. Triangular matrices.
  2005. Tribonacci Sequence
  2006. Triple Shiftian Numbers
  2007. Triple trouble
  2008. Troll Mystery Encoding
  2009. Truck driving time(Level I)
  2010. Trucks Driver Time.
  2011. True Addition
  2012. True Min
  2013. Trumpness detector
  2014. Truncate a string!
  2015. Tube strike options calculator
  2016. Turn any word into a beef taco
  2017. TV channels
  2018. Twice Their Age
  2019. Two arrays -- Zero rows and zero columns
  2020. Two cube sums
  2021. Two's complement
  2022. Two's Complement
  2023. Type of sum
  2024. Typoglycemia Generator
  2025. UN-usual Sort
  2026. Unary function chainer
  2027. Understanding closures - the basics
  2028. Unicode Madness: 東方名確認 ~ Eastern Title Validator.
  2029. UniDecoder
  2030. Union of Intervals
  2031. Unique digits sequence
  2032. Unique string characters
  2033. Unique Sum
  2034. uniquePush - No Dupes!
  2035. Unit-Test Inception
  2036. Unix command line ls -l extract the file type.
  2037. Unlucky Days
  2038. Unpacking Arguments
  2039. Unsecure login - Hack this code #1
  2040. Unshackle the Beast (uncontrolled components in ReactJS)
  2041. up AND down
  2042. upperCasePlace()
  2043. Upside down numbers
  2044. Upside-Down Numbers - Challenge Edition
  2045. Upside-Down Pyramid Addition...REVERSED!
  2046. Upstream/Downstream
  2047. Upturn Numeral Triangle
  2048. Urban Dictionary
  2049. URI codec (encode/decode)
  2050. UriBuilder
  2051. UVB-76 Message Validator
  2052. Valid Curly Braces (Code Golf)
  2053. Valid GB number plate?
  2054. Valid HK Phone Number
  2055. Vending Machine
  2056. Vertical symmetry on coordinate plane
  2057. Visa application centre
  2058. Visible Dots On a Die
  2059. Volume of a Cuboid
  2060. Vowel Alternations
  2061. Vowel one
  2062. Vowel Shifting
  2063. Vowel-consonant lexicon
  2064. Walk-up Stairs
  2065. Walter's miraculous FizzBuzz factory
  2066. Warm Up for Speed.
  2067. Warrior's adventure
  2068. Waving the Stream
  2069. We are Family
  2070. We are the Robots d[(0)(0)]b
  2071. We need these data immediately!
  2072. Weight of its Contents
  2073. Weighted Grading System
  2074. Weird Factory
  2075. Welcome to Economics! #1 Consumer Price Index
  2076. Welcome to Economics! #2 Economic Surplus
  2077. What Happened To My Object?
  2078. What happened to the vowels?
  2079. What The Biggest Search Keys?
  2080. What's a Perfect Power anyway?
  2081. What's in a name?
  2082. What's the pattern?
  2083. What’s the degree?
  2084. When's my birthday ?
  2085. When's the next train to Brighton?
  2086. Where did my Ether go?
  2087. Where do they meet?
  2088. Which are in?
  2089. Which Gas Station should I pick?
  2090. Whitespace Interpreter
  2091. Who ate the cookie?
  2092. Who can still win the Formula One World Championship?
  2093. Who is going to pay for the wall?
  2094. Who wins the card game?
  2095. Whole of Names
  2096. Whose bicycle?
  2097. Word Challenges at School
  2098. Word Finder
  2099. Word Segmentation: MaxMatch
  2100. Wordify an integer
  2101. Wordsearch
  2102. WordSquare
  2103. Working With Coloured Numbers
  2104. Working With Coloured Numbers II
  2105. Working with Dictionaries
  2106. World Bits War
  2107. World Rally Championship
  2108. Wrapped Function
  2109. Write a function to sort a given string into alphabetical order
  2110. Write a letter to your friend (给远方的朋友写封信)
  2111. Write out numbers
  2112. X marks the spot!
  2113. X plus Y Card problem
  2114. xml to object - xml #1
  2115. XOR string reduction
  2116. YaCG: #1 Yet another Card Kata !
  2117. YaCG: #2 One Trick, One Taker.
  2118. YaCG: #3 "no elephant were harmed..."
  2119. Yes No Yes No
  2120. You are a Cube!
  2121. You Can't Code Under Pressure #2
  2122. You're not my type
  2123. Your Ride Is Here
  2124. Zebulan's Nightmare
  2125. Zero fill... for the Queen!
  2126. zero-balanced Array
  2127. Zeros and Ones
  2128. Ziggurat Ride of Fortune