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letterChanges.js
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letterChanges.js
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/**
* Letter Changes Coderbyte Problem Solution
* Take the string parameter being passed and modify it using the following algorithm.
* Replace every letter in the string with the letter following it in the alphabet (ie. c becomes d, z becomes a).
* Then capitalize every vowel in this new string (a, e, i, o, u) and finally return this modified string.
* @summary Manipulating characters in a string based off their positions in the alphabet.
* @link https://coderbyte.com/information/Letter%20Changes
* @author Tam Nguyen <[email protected]>
*/
// --- Test Cases ---
console.log(LetterChanges("hello*3")); // Ifmmp*3
console.log(LetterChanges("fun times!")); // gvO Ujnft!
// --- Helper Functions ---
/**
* @param {String} string Takes a word or sentence
* @returns {String} returns a modified string in accordance to the algorithm
*/
function LetterChanges(string) {
string = string.toLowerCase();
let array = string.split("");
var alphabet = "abcdefghijklmnopqrstuvwxyza"
for(let i = 0; i < array.length; i++) {
if (alphabet.includes(array[i])) {
/** @function toNextAlphabetChar */
array[i] = toNextAlphabetChar(alphabet, alphabet.indexOf(array[i]));
}
/** @function upperCaseVowels */
array[i] = upperCaseVowels(array[i]);
}
let newStr = array.join("");
return newStr;
}
/**
* @param {String} letter
* @returns {String} Uppercase Vowel
*/
function upperCaseVowels(letter) {
if (letter == "a" || letter == "e" || letter == "i" || letter == "o" || letter == "u") {
return letter.toUpperCase();
} else {
return letter;
}
}
/**
* @param {String} alphabet
* @param {Number} position of the letter in the alphabet string
* @returns {String} the next letter in the alphabet string
*/
function toNextAlphabetChar(alphabet, position) {
position++;
return alphabet.charAt(position);
}