https://github.com/es-shims/array.prototype.findlast
An ESnext spec-compliant `Array.prototype.findLast` shim/polyfill/replacement that works as far down as ES3.
https://github.com/es-shims/array.prototype.findlast
array ecmascript findlast javascript polyfill shim
Last synced: about 1 month ago
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An ESnext spec-compliant `Array.prototype.findLast` shim/polyfill/replacement that works as far down as ES3.
- Host: GitHub
- URL: https://github.com/es-shims/array.prototype.findlast
- Owner: es-shims
- License: mit
- Created: 2021-07-14T04:04:34.000Z (almost 4 years ago)
- Default Branch: main
- Last Pushed: 2024-03-19T17:21:04.000Z (over 1 year ago)
- Last Synced: 2025-05-07T12:55:05.705Z (about 1 month ago)
- Topics: array, ecmascript, findlast, javascript, polyfill, shim
- Language: JavaScript
- Homepage:
- Size: 116 KB
- Stars: 4
- Watchers: 4
- Forks: 1
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Funding: .github/FUNDING.yml
- License: LICENSE
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README
# array.prototype.findlast [![Version Badge][npm-version-svg]][package-url]
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[![npm badge][npm-badge-png]][package-url]
An ESnext spec-compliant `Array.prototype.findLast` 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 proposed [spec](https://tc39.es/proposal-array-find-from-last).
Because `Array.prototype.findLast` depends on a receiver (the `this` value), the main export takes the array to operate on as the first argument.
## Getting started
```sh
npm install --save array.prototype.findlast
```
## Usage/Examples
```js
var findLast = require('array.prototype.findlast');
var assert = require('assert');
var arr = [1, [2], [], 3, [[4]]];
var isNumber = function (x) { return typeof x === 'number' };
assert.deepEqual(findLast(arr, isNumber), 3);
```
```js
var findLast = require('array.prototype.findlast');
var assert = require('assert');
/* when Array#findLast is not present */
delete Array.prototype.findLast;
var shimmed = findLast.shim();
assert.equal(shimmed, findLast.getPolyfill());
assert.deepEqual(arr.findLast(isNumber), findLast(arr, isNumber));
```
```js
var findLast = require('array.prototype.findlast');
var assert = require('assert');
/* when Array#findLast is present */
var shimmed = findLast.shim();
assert.equal(shimmed, Array.prototype.findLast);
assert.deepEqual(arr.findLast(isNumber), findLast(arr, isNumber));
```
## Tests
Simply clone the repo, `npm install`, and run `npm test`
[package-url]: https://npmjs.org/package/array.prototype.findlast
[npm-version-svg]: https://versionbadg.es/es-shims/Array.prototype.findLast.svg
[deps-svg]: https://david-dm.org/es-shims/Array.prototype.findLast.svg
[deps-url]: https://david-dm.org/es-shims/Array.prototype.findLast
[dev-deps-svg]: https://david-dm.org/es-shims/Array.prototype.findLast/dev-status.svg
[dev-deps-url]: https://david-dm.org/es-shims/Array.prototype.findLast#info=devDependencies
[npm-badge-png]: https://nodei.co/npm/array.prototype.findlast.png?downloads=true&stars=true
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[license-url]: LICENSE
[downloads-image]: https://img.shields.io/npm/dm/array.prototype.findlast.svg
[downloads-url]: https://npm-stat.com/charts.html?package=array.prototype.findlast
[codecov-image]: https://codecov.io/gh/es-shims/Array.prototype.findLast/branch/main/graphs/badge.svg
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[actions-url]: https://github.com/es-shims/Array.prototype.findLast