Mutations

//Return true if the string in the first element of the array contains all of the letters of the string in the second element of the array.

//For example, ["hello", "Hello"], should return true because all of the letters in the second string are present in the first, ignoring case.

//The arguments ["hello", "hey"] should return false because the string "hello" does not contain a "y".

//Lastly, ["Alien", "line"], should return true because all of the letters in "line" are present in "Alien".

function mutation(arr) {
  var test = arr[1].toLowerCase();
  var target = arr[0].toLowerCase();
  for (i=0;i<test.length;i++) {
    if (target.indexOf(test[i]) === -1)
      return false;
  }
  return true;
 }