http://www.freecodecamp.com/fcc0208647c 's solution for Bonfire: Mutations

bonfire-mutations#.js

// Bonfire: Mutations
// Author: @fcc0208647c
// Challenge: http://www.freecodecamp.com/challenges/bonfire-mutations#
// Learn to Code at Free Code Camp (www.freecodecamp.com)

function mutation(arr) {
    firstElement = arr[0].toLowerCase().split('');
    secondElement = arr[1].toLowerCase().split('');
   
    for (var i=0; i<secondElement.length; i++) {
       if(firstElement.indexOf(secondElement[i]) === -1){
         return false;
       }
             
      }
  
  return true;
      
}
mutation(["hello", "hey"]);