80 lines
2.7 KiB
Markdown
80 lines
2.7 KiB
Markdown
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# object.groupby <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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[![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 ESnext spec-compliant `Object.groupBy` 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-array-grouping/).
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## Getting started
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```sh
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npm install --save object.groupby
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```
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## Usage/Examples
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```js
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var groupBy = require('object.groupby');
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var assert = require('assert');
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var arr = [0, 1, 2, 3, 4, 5];
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var parity = function (x) { return x % 2 === 0 ? 'even' : 'odd'; };
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var results = groupBy(arr, function (x, i) {
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assert.equal(x, arr[i]);
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return parity(x);
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});
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assert.deepEqual(results, {
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__proto__: null,
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even: [0, 2, 4],
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odd: [1, 3, 5],
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});
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```
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```js
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var groupBy = require('object.groupby');
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var assert = require('assert');
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/* when Object.groupBy is not present */
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delete Object.groupBy;
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var shimmed = groupBy.shim();
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assert.equal(shimmed, groupBy.getPolyfill());
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assert.deepEqual(Object.groupBy(arr, parity), groupBy(arr, parity));
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```
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```js
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var groupBy = require('object.groupby');
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var assert = require('assert');
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/* when Array#group is present */
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var shimmed = groupBy.shim();
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assert.equal(shimmed, Object.groupBy);
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assert.deepEqual(Object.groupBy(arr, parity), groupBy(arr, parity));
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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/object.groupby
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[npm-version-svg]: https://versionbadg.es/es-shims/Object.groupBy.svg
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[deps-svg]: https://david-dm.org/es-shims/Object.groupBy.svg
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[deps-url]: https://david-dm.org/es-shims/Object.groupBy
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[dev-deps-svg]: https://david-dm.org/es-shims/Object.groupBy/dev-status.svg
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[dev-deps-url]: https://david-dm.org/es-shims/Object.groupBy#info=devDependencies
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[npm-badge-png]: https://nodei.co/npm/object.groupby.png?downloads=true&stars=true
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[license-image]: https://img.shields.io/npm/l/object.groupby.svg
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[license-url]: LICENSE
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[downloads-image]: https://img.shields.io/npm/dm/object.groupby.svg
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[downloads-url]: https://npm-stat.com/charts.html?package=object.groupby
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[codecov-image]: https://codecov.io/gh/es-shims/Object.groupBy/branch/main/graphs/badge.svg
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[codecov-url]: https://app.codecov.io/gh/es-shims/Object.groupBy/
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[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/es-shims/Object.groupBy
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[actions-url]: https://github.com/es-shims/Object.groupBy/actions
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