Function throttling implementation in ES6

es6-throttle.js

/*
http://www.es6fiddle.net/i8d8e1um/
*/
var throttle = (func,ms=50,context=window) => {
	let to;
	let wait=false;
	return (...args) => {
	  let later = () => {
		  func.apply(context,args);
	  };
	  if(!wait)  {
		  later();
		  wait = true;
		  to = setTimeout(() => {
		    wait = false;
		  },ms);
	  }
	};
};

let c = 1;

const throttled = throttle(function(i) {
  console.log('callback '+i);
},1000);
let id;
const callback = function _c() {
  throttled(c);
  c++;
  id = requestAnimationFrame(_c);
};
id = window.requestAnimationFrame(callback);

setTimeout(() => {
  window.cancelAnimationFrame(id);
  console.log('stopped');
},5000);