object.groupby ^{[![Version Badge][npm-version-svg]][package-url]}

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An ESnext spec-compliant Object.groupBy shim/polyfill/replacement that works as far down as ES3.

This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the proposed spec.

Getting started

``sh
npm install --save object.groupby
`

Usage/Examples

`js
var groupBy = require('object.groupby');
var assert = require('assert');

var arr = [0, 1, 2, 3, 4, 5];
var parity = function (x) { return x % 2 === 0 ? 'even' : 'odd'; };

var results = groupBy(arr, function (x, i) {
assert.equal(x, arr[i]);
return parity(x);
});

assert.deepEqual(results, {
__proto__: null,
even: [0, 2, 4],
odd: [1, 3, 5],
});
`

`js
var groupBy = require('object.groupby');
var assert = require('assert');
/ when Object.groupBy is not present /
delete Object.groupBy;
var shimmed = groupBy.shim();

assert.equal(shimmed, groupBy.getPolyfill());
assert.deepEqual(Object.groupBy(arr, parity), groupBy(arr, parity));
`

`js
var groupBy = require('object.groupby');
var assert = require('assert');
/ when Array#group is present /
var shimmed = groupBy.shim();

assert.equal(shimmed, Object.groupBy);
assert.deepEqual(Object.groupBy(arr, parity), groupBy(arr, parity));
`

Tests


Simply clone the repo, npm install, and run npm test`

[package-url]: https://npmjs.org/package/object.groupby
[npm-version-svg]: https://versionbadg.es/es-shims/Object.groupBy.svg
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[dev-deps-url]: https://david-dm.org/es-shims/Object.groupBy#info=devDependencies
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[license-url]: LICENSE
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