Convert a phrase to whale talk using function, loops, and arrays.

whale_talk.js

let input = 'Anh yeu em, yeu hon!';
const vowels = ['a', 'e', 'i', 'o', 'u'];
resultsArray = [];

function whaleTalk(phrase) {
  const lowerCasePhrase = phrase.toLowerCase();
  for (let l = 0; l < lowerCasePhrase.length; l++) {
    // console.log(lowerCasePhrase[l]);
    for (let v = 0; v < vowels.length; v++) {
      if (vowels[v] === lowerCasePhrase[l]) { // whales only use vowels.
        if (lowerCasePhrase[l] === 'e' || lowerCasePhrase[l] === 'u') { // e's and u's are doubled in whale talk.
          resultsArray.push(lowerCasePhrase[l], lowerCasePhrase[l]);
        } else { // all remaining vowels are singular.
          resultsArray.push(lowerCasePhrase[l]); 
        }
      }
    }
  }
  console.log(resultsArray.join(''));
}

whaleTalk(input);