https://github.com/es-shims/array.prototype.concat
ES spec-compliant Array.prototype.concat shim/polyfill/replacement that works as far down as ES3
https://github.com/es-shims/array.prototype.concat
array concat ecmascript javascript polyfill shim
Last synced: 3 months ago
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ES spec-compliant Array.prototype.concat shim/polyfill/replacement that works as far down as ES3
- Host: GitHub
- URL: https://github.com/es-shims/array.prototype.concat
- Owner: es-shims
- License: mit
- Created: 2022-05-03T21:32:59.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2024-03-19T17:24:37.000Z (over 1 year ago)
- Last Synced: 2025-08-09T01:39:08.475Z (4 months ago)
- Topics: array, concat, ecmascript, javascript, polyfill, shim
- Language: JavaScript
- Homepage:
- Size: 74.2 KB
- Stars: 1
- 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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# array.prototype.concat [![Version Badge][npm-version-svg]][package-url]
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An ES spec-compliant `Array.prototype.concat` 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://tc39.es/ecma262/#sec-array.prototype.concat).
Because `Array.prototype.concat` depends on a receiver (the “this” value), the main export takes the array to operate on as the first argument.
## Engines where this is needed
Note: this list is not exhaustive.
- Safari 10 - 13
- Chrome 48+ ([v8 bug](https://bugs.chromium.org/p/v8/issues/detail?id=10381))
- node 6+
## Example
```js
var concat = require('array.prototype.concat');
var assert = require('assert');
var a = [1, 1, 1];
assert.deepEqual(concat(a, 1, 2), [1, 1, 1, 1, 2]);
assert.deepEqual(a, [1, 1, 1]);
```
```js
var concat = require('array.prototype.concat');
var assert = require('assert');
/* when Array#concat is not present */
delete Array.prototype.concat;
var shimmed = concat.shim();
assert.equal(shimmed, concat.getPolyfill());
assert.equal(shimmed, Array.prototype.concat);
assert.deepEqual([1, 2, 3].concat(1, 2, 3), concat([1, 2, 3], 1, 2, 3));
```
```js
var concat = require('array.prototype.concat');
var assert = require('assert');
/* when Array#concat is present */
var shimmed = concat.shim();
assert.equal(shimmed, Array.prototype.concat);
assert.deepEqual([1, 2, 3].concat(1, 2, 3), concat([1, 2, 3], 1, 2, 3));
```
## Tests
Simply clone the repo, `npm install`, and run `npm test`
[package-url]: https://npmjs.org/package/array.prototype.concat
[npm-version-svg]: https://versionbadg.es/es-shims/Array.prototype.concat.svg
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[deps-url]: https://david-dm.org/es-shims/Array.prototype.concat
[dev-deps-svg]: https://david-dm.org/es-shims/Array.prototype.concat/dev-status.svg
[dev-deps-url]: https://david-dm.org/es-shims/Array.prototype.concat#info=devDependencies
[npm-badge-png]: https://nodei.co/npm/array.prototype.concat.png?downloads=true&stars=true
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[license-url]: LICENSE
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