grill.js

//https://www.codewars.com/kata/grill-it/train/javascript
function grille(message, code) {

	let code_bin = (code >>> 0).toString(2);
	let message_test = message.substr(-code_bin.length);
  
	return Array.prototype.filter.call(message_test, (w, n) => (code_bin[n] == "1")).join('')
}