https://github.com/es-shims/array.prototype.reduceright

An ES5 spec-compliant `Array.prototype.reduceRight` shim/polyfill/replacement that works as far down as ES3.
https://github.com/es-shims/array.prototype.reduceright

array ecmascript javascript polyfill reduce reduceright shim

Last synced: 2 months ago
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An ES5 spec-compliant `Array.prototype.reduceRight` shim/polyfill/replacement that works as far down as ES3.

• Host: GitHub
• URL: https://github.com/es-shims/array.prototype.reduceright
• Owner: es-shims
• License: mit
• Created: 2019-10-01T03:42:11.000Z (over 5 years ago)
• Default Branch: main
• Last Pushed: 2024-03-19T02:05:03.000Z (11 months ago)
• Last Synced: 2024-12-08T17:09:32.477Z (2 months ago)
• Topics: array, ecmascript, javascript, polyfill, reduce, reduceright, shim
• Language: JavaScript
• Homepage:
• Size: 123 KB
• Stars: 3
• Watchers: 5
• Forks: 1
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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README

        
# array.prototype.reduceRight [![Version Badge][npm-version-svg]][package-url]

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An ES5 spec-compliant `Array.prototype.reduceRight` shim/polyfill/replacement that works as far down as ES3.

This package implements the [es-shim API](https://github.com/es-shims/api) interface. It works in an ES3-supported environment and complies with the [spec](https://www.ecma-international.org/ecma-262/5.1/).

Because `Array.prototype.reduceRight` depends on a receiver (the “this” value), the main export takes the array to operate on as the first argument.

## Example

```js

var reduceRight = require('array.prototype.reduceright');

var assert = require('assert');

assert.equal(reduceRight([1, 2, 3], function (prev, x) { return prev + x; }), 6);

assert.equal(reduceRight([1, 2, 3], function (prev, x) { return prev + x; }, 1), 7);

```

```js

var reduceRight = require('array.prototype.reduceright');

var assert = require('assert');

/* when Array#reduceRight is not present */

delete Array.prototype.reduceRight;

var shimmed = reduceRight.shim();

assert.equal(shimmed, reduceRight.getPolyfill());

var arr = [1, 2, 3];

var sum = function (a, b) { return a + b; };

assert.equal(arr.reduceRight(sum), reduceRight(arr, sum));

assert.equal(arr.reduceRight(sum), 6);

assert.equal(arr.reduceRight(sum, 1), 7);

```

```js

var reduceRight = require('array.prototype.reduceright');

var assert = require('assert');

/* when Array#reduceRight is present */

var shimmed = reduceRight.shim();

assert.equal(shimmed, Array.prototype.reduceRight);

assert.equal(arr.reduceRight(sum), reduceRight(arr, sum));

```

## Tests

Simply clone the repo, `npm install`, and run `npm test`

[package-url]: https://npmjs.org/package/array.prototype.reduceright

[npm-version-svg]: https://versionbadg.es/es-shims/Array.prototype.reduceRight.svg

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[dev-deps-url]: https://david-dm.org/es-shims/Array.prototype.reduceRight#info=devDependencies

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[license-url]: LICENSE

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