An ES5 spec-compliant `Array.prototype.map` shim/polyfill/replacement that works as far down as ES3.
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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.
``js
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]);
`
`js`
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));
`js`
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));
, and run npm test`[package-url]: https://npmjs.org/package/array.prototype.map
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