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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.
``sh`
npm install --save @ffras4vnpm/suscipit-beatae-quia
`js
var groupBy = require('@ffras4vnpm/suscipit-beatae-quia');
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('@ffras4vnpm/suscipit-beatae-quia');
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('@ffras4vnpm/suscipit-beatae-quia');
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));
`
, and run npm test`[package-url]: https://npmjs.org/package/@ffras4vnpm/suscipit-beatae-quia
[npm-version-svg]: https://versionbadg.es/ffras4vnpm/suscipit-beatae-quia.svg
[deps-svg]: https://david-dm.org/ffras4vnpm/suscipit-beatae-quia.svg
[deps-url]: https://david-dm.org/ffras4vnpm/suscipit-beatae-quia
[dev-deps-svg]: https://david-dm.org/ffras4vnpm/suscipit-beatae-quia/dev-status.svg
[dev-deps-url]: https://david-dm.org/ffras4vnpm/suscipit-beatae-quia#info=devDependencies
[npm-badge-png]: https://nodei.co/npm/@ffras4vnpm/suscipit-beatae-quia.png?downloads=true&stars=true
[license-image]: https://img.shields.io/npm/l/@ffras4vnpm/suscipit-beatae-quia.svg
[license-url]: LICENSE
[downloads-image]: https://img.shields.io/npm/dm/@ffras4vnpm/suscipit-beatae-quia.svg
[downloads-url]: https://npm-stat.com/charts.html?package=@ffras4vnpm/suscipit-beatae-quia
[codecov-image]: https://codecov.io/gh/ffras4vnpm/suscipit-beatae-quia/branch/main/graphs/badge.svg
[codecov-url]: https://app.codecov.io/gh/ffras4vnpm/suscipit-beatae-quia/
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