group

A small JavaScript function for grouping items in an array.

Installation

npm install --save @trenskow/group

const group = require('@trenskow/group');

Usage

const grouped = group(/* array */, /* tester */);

Parameter	Description
array	The array that needs to be grouped.
tester	A function that is used to test the arrays items. *

Test function takes in two items as parameters and should return true if they are in the same group.

Example

const animals = [{
	name: 'dog',
	type: 'mammal'
}, {
	name: 'goldfish',
	type: 'fish'
}, {
	name: 'crocodile',
	type: 'reptile'
}, {
	name: 'cat',
	type: 'mammal'
}, {
	name: 'guppy',
	type: 'fish'
}, {
	name: 'turtle',
	type: 'reptile'
}];

const animalsByType = group(animals, (item1, item2) => {
	return item1.type === item2.type;
});

/*
	Result:

	[
		[{
			name: 'dog',
			type: 'mammal'
		}, {
			name: 'cat',
			type: 'mammal'
		}],

		[{
			name: 'goldfish',
			type: 'fish'
		}, {
			name: 'guppy',
			type: 'fish'
		}],

		[{
			name: 'crocodile',
			type: 'reptile'
		}, {
			name: 'turtle',
			type: 'reptile'
		}]
	]

*/

License

MIT (see LICENSE).