Algorithm Repeat A String Repeat A String - thelastmile/FreeCodeCamp GitHub Wiki
Algorithm Repeat a String
:triangular_flag_on_post: Remember to use Read-Search-Ask
if you get stuck. Try to pair program :busts_in_silhouette: and write your own code :pencil:
:checkered_flag: Problem Explanation:
The program is very simple, we have to take a variable and return that variable being repeated certain amount of times. No need to add space or anything, just keep repeating it into one single string.
Relevant Links
:speech_balloon: Hint: 1
You can't edit strings, you will need to create a variable to store the new string.
try to solve the problem now
:speech_balloon: Hint: 2
Create a loop to repeat the code as many times as needed.
try to solve the problem now
:speech_balloon: Hint: 3
Make the variable created store the current value and append the word to it.
try to solve the problem now
Spoiler Alert!
Solution ahead!
:beginner: Basic Code Solution:
function repeatStringNumTimes(str, num) {
var accumulatedStr = '';
while (num > 0) {
accumulatedStr += str;
num--;
}
return accumulatedStr;
}
:rocket: Run Code
Code Explanation:
- Create an empty string variable to store the repeated word.
- Use a while loop or for loop to repeat code as many times as needed according to
num
- Then we just have to add the string to the variable created on step one, and increase or decrease
num
depending on how you set the loop. - At the end of the loop, return the variable for the repeated word.
Relevant Links
:sunflower: Intermediate Code Solution:
function repeatStringNumTimes(str, num) {
if(num < 0)
return "";
if(num === 1)
return str;
else
return str + repeatStringNumTimes(str, num - 1);
}
:rocket: Run Code
Code Explanation:
- This solution uses recursion.
- We check if
num
is negative and return an empty string if true. - Then we check if it's equal to 1 and in that case we return the string itself.
- If not, we add the string to a call of our function with
num
being decreased by 1, which will add anotherstr
and another.. until eventuallynum
is 1. And return that whole process.
Relevant Links
:rotating_light: Advanced Code Solution:
function repeatStringNumTimes(str, num) {
return num >= 0 ? str.repeatStringNumTimes(num) : "";
}
repeatStringNumTimes("abc", 3);
:rocket: Run Code
Code Explanation:
- This solution takes a declarative approach.
- It is similar to the third solution, except it uses the ternary operator form of the
if
statement.
Relevant Links
:trophy: Credits:
If you found this page useful, you may say thanks to the contributors by copying and pasting the following line in the main chat:
Thanks @Rafase282 @shadowfool @Hallaathrad @sgalizia for your help with Algorithm: Repeat a String Repeat a String
:clipboard: NOTES FOR CONTRIBUTIONS:
- :warning: DO NOT add solutions that are similar to any existing solutions. If you think it is similar but better, then try to merge (or replace) the existing similar solution.
- Add an explanation of your solution.
- Categorize the solution in one of the following categories — Basic, Intermediate and Advanced. :traffic_light:
- Please add your username only if you have added any relevant main contents. (:warning: DO NOT remove any existing usernames)
See :point_right:
Wiki Challenge Solution Template
for reference.