'use strict';

var callable     = require('es5-ext/object/valid-callable')
  , nextTick     = require('next-tick')
  , validTimeout = require('./valid-timeout')

  , apply = Function.prototype.apply;

module.exports = function (fn/*, timeout*/) {
	var delay, timeout = arguments[1];
	callable(fn);
	if (timeout === undefined) {
		delay = nextTick;
	} else {
		timeout = validTimeout(timeout);
		delay = setTimeout;
	}
	return function () { return delay(apply.bind(fn, this, arguments), timeout); };
};