An ES spec-compliant Array.prototype.forEach shim/polyfill/replacement that works as far down as ES3.
This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the spec.
Because Array.prototype.forEach depends on a receiver (the this value), the main export takes the array to operate on as the first argument.
npm install --save array.prototype.foreachvar forEach = require('array.prototype.foreach');
var assert = require('assert');
var arr = [1, [2], [], 3, [[4]]];
var counter = 0;
var increaseCounter = function (x) { counter += 1; };
assert.equal(forEach(arr, increaseCounter), undefined);
assert.equal(counter, arr.length);var forEach = require('array.prototype.foreach');
var assert = require('assert');
/* when Array#forEach is not present */
delete Array.prototype.forEach;
var shimmed = forEach.shim();
var counter = 0;
assert.equal(shimmed, forEach.getPolyfill());
assert.equal(arr.forEach(increaseCounter), forEach(arr, increaseCounter));
assert.equal(counter, arr.length * 2);var forEach = require('array.prototype.foreach');
var assert = require('assert');
/* when Array#forEach is present */
var shimmed = forEach.shim();
var counter = 0;
assert.equal(shimmed, Array.prototype.forEach);
assert.equal(arr.forEach(increaseCounter), forEach(arr, increaseCounter));
assert.equal(counter, arr.length * 2);Simply clone the repo, npm install, and run npm test