Algorithm Pig Latin - ashish9342/FreeCodeCamp GitHub Wiki
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You need to create a program that will translate from English to Pig Latin. Pig Latin takes the first consonant (or consonant cluster) of an English word, moves it to the end of the word and suffixes an "ay". If a word begins with a vowel you just add "way" to the end. It might not be obvious but you need to remove all the consonants up to the first vowel in case the word does not start with a vowel.
You will probably want to use regular expressions. This will allow you to convert the words easily.
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If the first character is a vowel, then take that whole word and add 'way' at the end. Otherwise comes the tricky part, take the consonant(s) before the first vowel and move it to the end and add 'ay'. This might be confusing but, it is not just the first consonant but all of them before the first vowel.
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You will need to use everything you know about string manipulation to get the last part right. However, it can be done with substr
alone.
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Solution ahead!
function translatePigLatin(str) {
// Create variables to be used
var pigLatin = '';
var regex = /[aeiou]/gi;
// Check if the first character is a vowel
if (str[0].match(regex)) {
pigLatin = str + 'way';
} else {
// Find how many consonants before the first vowel.
var vowelIndice = str.indexOf(str.match(regex)[0]);
// Take the string from the first vowel to the last char
// then add the consonants that were previously omitted and add the ending.
pigLatin = str.substr(vowelIndice) + str.substr(0, vowelIndice) + 'ay';
}
return pigLatin;
}
// test here
translatePigLatin("consonant");
🚀 Run Code
- Make an empty string to hold your Pig Latin word.
- Assign your appropriate regular expression to a variable.
- If the first character is a vowel, just add way to end of string and return it.
- If the first character is not a vowel:
- Find number of consonants before first vowel with help of
indexOf()
,match()
and regex. - Start Pig Latin string with first vowel till the end.
- Add letters before first vowel to end of string.
-
substr()
is used for string manipulation here. - Add ay to end of string and return it.
- Find number of consonants before first vowel with help of
function translatePigLatin(str) {
function check(obj) {
return ['a','i','u','e','o'].indexOf(str.charAt(obj)) == -1 ? check(obj + 1) : obj;
}
return str.substr(check(0)).concat((check(0) === 0 ? 'w' : str.substr(0, check(0))) + 'ay');
}
// test here
translatePigLatin("consonant");
🚀 Run Code
- This is a declarative as well as recursive approach to this problem.
-
check()
is a function which checks for first letter of string to be in the array of vowels,['a','i','u','e','o']
. - In case of consonants,
check()
calls itself on the next characters until finding the first vowel. - It'll return the index of whatever it finds to be the last initial consonant i.e., Schmidtsville's would be 3.
- Then, letters up until that index are removed from the string and concatenated with either that same chunk of removed string or w accordingly, and then ay regardless.
function translatePigLatin(str) {
var strArr = [];
var tmpChar;
// check if the char is consonant using RegEx
function isConsonant(char) {
return !/[aeiou]/.test(char);
}
// return initial str + "way" if it starts with vowel
// if not - convert str to array
if (!isConsonant(str.charAt(0)))
return str + "way";
else
strArr = str.split("");
// push all consonats to the end of the array
while (isConsonant(strArr[0])) {
tmpChar = strArr.shift();
strArr.push(tmpChar);
}
// convert array to string and concatenate "ay" at the end
return strArr.join("")+"ay";
}
// test here
translatePigLatin("consonant");
🚀 Run Code
-
isConsonant()
is used to check if a character is a consonant. - If first character is vowel, add way to end of string and return it.
- If first character is not a vowel:
- Split string into array using
split()
. - Push all consonants to end of array with help of
shift()
andpush()
. - Convert array to string using
join()
and add ay to end of string. Return it.
- Split string into array using
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