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

bonfire-mutations#.js

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

function mutation(arr) {
  var first = arr[0].toLowerCase().split('');
  var query = arr[1].toLowerCase().split('');
  
  for (var i = 0; i < query.length; i++){
  	var value = first.indexOf(query[i]);
	if (value === -1) {
		return false;
	} 
  }
  return true;
}

mutation(["hello", "hey"]);