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showing results for - "javascript array group by id"
Cyprien
11 May 2017
1function groupByKey(array, key) {
2   return array
3     .reduce((hash, obj) => {
4       if(obj[key] === undefined) return hash; 
5       return Object.assign(hash, { [obj[key]]:( hash[obj[key]] || [] ).concat(obj)})
6     }, {})
7}
8
9
10var cars = [{'make':'audi','model':'r8','year':'2012'},{'make':'audi','model':'rs5','year':'2013'},{'make':'ford','model':'mustang','year':'2012'},{'make':'ford','model':'fusion','year':'2015'},{'make':'kia','model':'optima','year':'2012'}];
11
12var result = groupByKey(cars, 'make');
13
14JSON.stringify(result,"","\t");
15{
16	"audi": [
17		{
18			"make": "audi",
19			"model": "r8",
20			"year": "2012"
21		},
22		{
23			"make": "audi",
24			"model": "rs5",
25			"year": "2013"
26		}
27	],
28	"ford": [
29		{
30			"make": "ford",
31			"model": "mustang",
32			"year": "2012"
33		},
34		{
35			"make": "ford",
36			"model": "fusion",
37			"year": "2015"
38		}
39	],
40	"kia": [
41		{
42			"make": "kia",
43			"model": "optima",
44			"year": "2012"
45		}
46	]
47}
source
Alexa
13 Apr 2016
1var results = orgs.reduce(function(results, org) {
2    (results[org.id] = results[org.id] || []).push(org);
3    return results;
4}, {})
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