GitHub - niksy/array-group-by-ponyfill: `Array.prototype.groupBy` ponyfill.
source link: https://github.com/niksy/array-group-by-ponyfill
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array-group-by-ponyfill
Array.prototype.groupBy
ponyfill.
A proposal to make grouping of items in an array easier.
Install
npm install array-group-by-ponyfill --save
Usage
import groupBy from 'array-group-by-ponyfill'; groupBy([1, 2, 3, 4, 5], (value) => (value % 2 === 0 ? 'even' : 'odd')); // { odd: [1, 3, 5], even: [2, 4] }
You can use named export preferNative
if you wish to use native
implementation if it’s available. In all other cases, ponyfill will be used.
Beware of
caveats!
groupBy(array, callback)
Returns: object
Group array items.
array
Type: any[]
Array to group.
callback
Type: Function
Callback which should return key with which to group array.
Argument Type Description
value
any
Current iteration value.
index
number
Current iteration index.
array
any[]
Original array reference.
Browser support
Tested in Chrome 72, Edge 15, Firefox 65 and should work in all modern browsers (support based on Browserslist configuration).
Test suite is taken and modified from core-js test suite.
For automated tests, run npm run test:automated
(append :watch
for watcher
support).
License
MIT © Ivan Nikolić
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