Example implementations of delay

delay.js

function delay (fn, wait) {
  var args = Array.prototype.slice.call(arguments, 2)
  setTimeout(function () {
    return fn.apply(this, args)
  }, wait)
}

// with ES6 rest operator instead of slicing arguments object 
const delay2 = (fn, wait, ...args) => {
  setTimeout(() => fn.apply(this, args), wait)
}