vowelDoubler.js

/**
 * Created by alexi on 5/30/17.
 */
// Given an array of characters, return the array with every vowel doubled. For example:

var input = ['w','h','a','t',' ','o','n',' ','e','a','r','t','h',' ','a','r','e',' ','y','o','u',' ','t','a','l','k','i','n','g',' ','a','b','o','u','t','?'];
var expectedOutput = ['w','h','a','a','t',' ','o','o','n',' ','e','e','a','a','r','t','h',' ','a','a','r','e','e',' ','y','o','o','u','u',' ','t','a','a','l','k','i','i','n','g',' ','a','a','b','o','o','u','u','t','?'];

var vowelDoubler = function(array){
  var vowels = ['a', 'e', 'i', 'o', 'u'];
  for (var i = 0; i < array.length; i++){
    if ( vowels.includes(array[i]) ) {
      var tempVowel = array[i];
      var tempArray = array.splice(i, array.length);
      array[i] = tempVowel;
      array.push.apply(array, tempArray);
      i++;
    }
  }
  return array;
}

var output = vowelDoubler(input);
console.log(output);

var isDoubler = function (output, expectedOutput) {
  var stringifyOuput = JSON.stringify(output);
  var stringifyExpected = JSON.stringify(expectedOutput);
  return stringifyExpected === stringifyOuput ? true : false;
}
console.log(isDoubler(output, expectedOutput));  // => true