es5-ext/array/#/intersection.js

"use strict";

var value    = require("../../object/valid-value")
  , contains = require("./contains")
  , byLength = require("./_compare-by-length")

  , filter = Array.prototype.filter, push = Array.prototype.push
  , slice = Array.prototype.slice;

module.exports = function (/* …list*/) {
	var lists;
	if (!arguments.length) slice.call(this);
	push.apply(lists = [this], arguments);
	lists.forEach(value);
	lists.sort(byLength);
	return lists.reduce(function (a, b) {
		return filter.call(a, function (x) {
 return contains.call(b, x);
});
	});
};