group-by

Group an array of values by property or callback function.

Installation

$ component install component/group-by
$ npm install group-by

API

$3

Map returning a new array:

``js
var groupBy = require('group-by');

var log1 = { type: 'log', version: '1.0.0' };
var log2 = { type: 'log', version: '1.1.0' };
var log3 = { type: 'log', version: '1.3.0' };
var app1 = { type: 'app', version: '1.0.0' };
var app2 = { type: 'app', version: '1.1.0' };

var nodes = [log1, app1, log2, log3, app2];

groupBy(nodes, 'type');
`

yields:

`js
{ log:
[ { type: 'log', version: '1.0.0' },
{ type: 'log', version: '1.1.0' },
{ type: 'log', version: '1.3.0' } ],
app:
[ { type: 'app', version: '1.0.0' },
{ type: 'app', version: '1.1.0' } ] }
`

$3

Group with an arbitrary fn, returning a key name:

`js
groupBy(users, function(user){
return user.pets.length
? 'hasPets'
: 'noPets';
})
``

License

MIT