76 lines
2.9 KiB
Markdown
Executable file
76 lines
2.9 KiB
Markdown
Executable file
# array.prototype.flat <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
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[![github actions][actions-image]][actions-url]
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[![coverage][codecov-image]][codecov-url]
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[![dependency status][deps-svg]][deps-url]
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[![dev dependency status][dev-deps-svg]][dev-deps-url]
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[![License][license-image]][license-url]
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[![Downloads][downloads-image]][downloads-url]
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[![npm badge][npm-badge-png]][package-url]
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An ES2019 spec-compliant `Array.prototype.flat` shim/polyfill/replacement that works as far down as ES3.
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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.github.io/proposal-flatMap/).
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Because `Array.prototype.flat` depends on a receiver (the `this` value), the main export takes the array to operate on as the first argument.
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## Getting started
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```sh
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npm install --save array.prototype.flat
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```
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## Usage/Examples
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```js
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var flat = require('array.prototype.flat');
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var assert = require('assert');
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var arr = [1, [2], [], 3, [[4]]];
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assert.deepEqual(flat(arr, 1), [1, 2, 3, [4]]);
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```
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```js
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var flat = require('array.prototype.flat');
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var assert = require('assert');
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/* when Array#flat is not present */
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delete Array.prototype.flat;
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var shimmedFlat = flat.shim();
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assert.equal(shimmedFlat, flat.getPolyfill());
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assert.deepEqual(arr.flat(), flat(arr));
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```
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```js
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var flat = require('array.prototype.flat');
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var assert = require('assert');
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/* when Array#flat is present */
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var shimmedIncludes = flat.shim();
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var mapper = function (x) { return [x, 1]; };
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assert.equal(shimmedIncludes, Array.prototype.flat);
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assert.deepEqual(arr.flat(mapper), flat(arr, mapper));
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```
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## Tests
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Simply clone the repo, `npm install`, and run `npm test`
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[package-url]: https://npmjs.org/package/array.prototype.flat
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[npm-version-svg]: https://versionbadg.es/es-shims/Array.prototype.flat.svg
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[deps-svg]: https://david-dm.org/es-shims/Array.prototype.flat.svg
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[deps-url]: https://david-dm.org/es-shims/Array.prototype.flat
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[dev-deps-svg]: https://david-dm.org/es-shims/Array.prototype.flat/dev-status.svg
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[dev-deps-url]: https://david-dm.org/es-shims/Array.prototype.flat#info=devDependencies
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[npm-badge-png]: https://nodei.co/npm/array.prototype.flat.png?downloads=true&stars=true
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[license-image]: https://img.shields.io/npm/l/array.prototype.flat.svg
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[license-url]: LICENSE
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[downloads-image]: https://img.shields.io/npm/dm/array.prototype.flat.svg
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[downloads-url]: https://npm-stat.com/charts.html?package=array.prototype.flat
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[codecov-image]: https://codecov.io/gh/es-shims/Array.prototype.flat/branch/main/graphs/badge.svg
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[codecov-url]: https://app.codecov.io/gh/es-shims/Array.prototype.flat/
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[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/es-shims/Array.prototype.flat
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[actions-url]: https://github.com/es-shims/Array.prototype.flat/actions
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