An ES5 spec-compliant Array.prototype.map 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.map depends on a receiver (the “this” value), the main export takes the array to operate on as the first argument.
var map = require('array.prototype.map'); var assert = require('assert'); assert.deepEqual(map([1, 1, 1], function (x) { return x + 1; }), [2, 2, 2]); assert.deepEqual(map([1, 0, 1], function (x) { return x + 1; }), [2, 1, 2]);var map = require('array.prototype.map'); var assert = require('assert'); /* when Array#map is not present */ delete Array.prototype.map; var shimmedMap = map.shim(); assert.equal(shimmedMap, map.getPolyfill()); var arr = [1, 2, 3]; var add4 = function (x) { return x + 4; }; assert.deepEqual(arr.map(add4), map(arr, add4));var map = require('array.prototype.map'); var assert = require('assert'); /* when Array#map is present */ var shimmedMap = map.shim(); assert.equal(shimmedMap, Array.prototype.map); assert.deepEqual(arr.map(add4), map(arr, add4));Simply clone the repo, npm install, and run npm test