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showing results for - "javascript array group by"
Gordon
14 Jul 2018
1function groupArrayOfObjects(list, key) {
2  return list.reduce(function(rv, x) {
3    (rv[x[key]] = rv[x[key]] || []).push(x);
4    return rv;
5  }, {});
6};
7
8var people = [
9    {sex:"Male", name:"Jeff"},
10    {sex:"Female", name:"Megan"},
11    {sex:"Male", name:"Taylor"},
12    {sex:"Female", name:"Madison"}
13];
14var groupedPeople=groupArrayOfObjects(people,"sex");
15console.log(groupedPeople.Male);//will be the Males 
16console.log(groupedPeople.Female);//will be the Females
source
Wilbur
22 Feb 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}
Bronson
07 Feb 2016
1var results = orgs.reduce(function(results, org) {
2    (results[org.id] = results[org.id] || []).push(org);
3    return results;
4}, {})
source
Alessandro
13 Jun 2017
1let group = cars.reduce((r, a) => { console.log("a", a); console.log('r', r); r[a.make] = [...r[a.make] || [], a]; return r;}, {});console.log("group", group);
Erica
09 Aug 2020
1function groupBy(list, keyGetter) {
2    const map = new Map();
3    list.forEach((item) => {
4         const key = keyGetter(item);
5         const collection = map.get(key);
6         if (!collection) {
7             map.set(key, [item]);
8         } else {
9             collection.push(item);
10         }
11    });
12    return map;
13}
14
15// example usage
16
17const pets = [
18    {type:"Dog", name:"Spot"},
19    {type:"Cat", name:"Tiger"},
20    {type:"Dog", name:"Rover"}, 
21    {type:"Cat", name:"Leo"}
22];
23    
24const grouped = groupBy(pets, pet => pet.type);
25    
26console.log(grouped.get("Dog")); // -> [{type:"Dog", name:"Spot"}, {type:"Dog", name:"Rover"}]
27console.log(grouped.get("Cat")); // -> [{type:"Cat", name:"Tiger"}, {type:"Cat", name:"Leo"}]
28    
29
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