| [9af201e] | 1 | # object.groupby <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
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| 2 |
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| 3 | [![github actions][actions-image]][actions-url]
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| 4 | [![coverage][codecov-image]][codecov-url]
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| 5 | [![License][license-image]][license-url]
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| 6 | [![Downloads][downloads-image]][downloads-url]
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| 7 |
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| 8 | [![npm badge][npm-badge-png]][package-url]
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| 9 |
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| 10 | An ESnext spec-compliant `Object.groupBy` shim/polyfill/replacement that works as far down as ES3.
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| 11 |
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| 12 | 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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| 13 |
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| 14 | ## Getting started
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| 15 |
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| 16 | ```sh
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| 17 | npm install --save object.groupby
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| 18 | ```
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| 19 |
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| 20 | ## Usage/Examples
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| 21 |
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| 22 | ```js
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| 23 | var groupBy = require('object.groupby');
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| 24 | var assert = require('assert');
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| 25 |
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| 26 | var arr = [0, 1, 2, 3, 4, 5];
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| 27 | var parity = function (x) { return x % 2 === 0 ? 'even' : 'odd'; };
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| 28 |
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| 29 | var results = groupBy(arr, function (x, i) {
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| 30 | assert.equal(x, arr[i]);
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| 31 | return parity(x);
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| 32 | });
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| 33 |
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| 34 | assert.deepEqual(results, {
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| 35 | __proto__: null,
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| 36 | even: [0, 2, 4],
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| 37 | odd: [1, 3, 5],
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| 38 | });
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| 39 | ```
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| 40 |
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| 41 | ```js
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| 42 | var groupBy = require('object.groupby');
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| 43 | var assert = require('assert');
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| 44 | /* when Object.groupBy is not present */
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| 45 | delete Object.groupBy;
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| 46 | var shimmed = groupBy.shim();
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| 47 |
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| 48 | assert.equal(shimmed, groupBy.getPolyfill());
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| 49 | assert.deepEqual(Object.groupBy(arr, parity), groupBy(arr, parity));
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| 50 | ```
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| 51 |
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| 52 | ```js
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| 53 | var groupBy = require('object.groupby');
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| 54 | var assert = require('assert');
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| 55 | /* when Array#group is present */
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| 56 | var shimmed = groupBy.shim();
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| 57 |
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| 58 | assert.equal(shimmed, Object.groupBy);
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| 59 | assert.deepEqual(Object.groupBy(arr, parity), groupBy(arr, parity));
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| 60 | ```
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| 61 |
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| 62 | ## Tests
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| 63 | Simply clone the repo, `npm install`, and run `npm test`
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| 64 |
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| 65 | [package-url]: https://npmjs.org/package/object.groupby
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| 66 | [npm-version-svg]: https://versionbadg.es/es-shims/Object.groupBy.svg
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| 67 | [deps-svg]: https://david-dm.org/es-shims/Object.groupBy.svg
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| 68 | [deps-url]: https://david-dm.org/es-shims/Object.groupBy
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| 69 | [dev-deps-svg]: https://david-dm.org/es-shims/Object.groupBy/dev-status.svg
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| 70 | [dev-deps-url]: https://david-dm.org/es-shims/Object.groupBy#info=devDependencies
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| 71 | [npm-badge-png]: https://nodei.co/npm/object.groupby.png?downloads=true&stars=true
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| 72 | [license-image]: https://img.shields.io/npm/l/object.groupby.svg
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| 73 | [license-url]: LICENSE
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| 74 | [downloads-image]: https://img.shields.io/npm/dm/object.groupby.svg
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| 75 | [downloads-url]: https://npm-stat.com/charts.html?package=object.groupby
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| 76 | [codecov-image]: https://codecov.io/gh/es-shims/Object.groupBy/branch/main/graphs/badge.svg
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| 77 | [codecov-url]: https://app.codecov.io/gh/es-shims/Object.groupBy/
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| 78 | [actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/es-shims/Object.groupBy
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| 79 | [actions-url]: https://github.com/es-shims/Object.groupBy/actions
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