Javascript: reduce array of objects in array of properties object

Question

I want reduce an array of object, eg.:

const users = [
    {id: 1, username: 'foo'}, 
    {id: 2, username: 'bar'}, 
    {id: 3, username: 'baz'}
];

to an array of id, eg.:

users.reduce( magicReducer ); // output: [1,2,3]

is possible?

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map ? — Konstantin, Jun 30 '20 at 10:47

score 3 · Answer 1 · answered Jun 30 '20 at 10:47

3

This should solve the problem for you !

const users = [{id: 1, username: 'foo'}, {id: 2, username: 'bar'}, {id: 3, username: 'baz'}];

console.log(users.map(user => user.id))

answered Jun 30 '20 at 10:47

Harmandeep Singh Kalsi

3,215
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Please vote to close questions that have been asked thousands of times – adiga Jun 30 '20 at 10:51
@adiga , I dont think I have that privilege yet. – Harmandeep Singh Kalsi Jun 30 '20 at 10:53
You get access to [flag questions](https://stackoverflow.com/help/privileges/flag-posts) as duplicates at 15 reps. – adiga Jun 30 '20 at 10:54
Sure will make sure do the same next time! THank for the information – Harmandeep Singh Kalsi Jun 30 '20 at 10:56

score 1 · Accepted Answer · answered Jun 30 '20 at 10:48

1

You don't need reduce for the required magic, you can simply use array .map() for this like:

const users = [{id: 1, username: 'foo'}, {id: 2, username: 'bar'}, {id: 3, username: 'baz'}];
const res = users.map(({id}) => id);

console.log(res)

answered Jun 30 '20 at 10:48

palaѕн

68,816
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1

Please vote to close duplicates. – adiga Jun 30 '20 at 10:51

score 1 · Answer 3 · answered Jun 30 '20 at 10:48

1

try this

const users = [
    {id: 1, username: 'foo'}, 
    {id: 2, username: 'bar'}, 
    {id: 3, username: 'baz'}
];

ids=users.map(x=>x.id)
console.log(ids)

answered Jun 30 '20 at 10:48

Sven.hig

4,411
2
6
18

1

Please vote to close duplicates. – adiga Jun 30 '20 at 10:51

Javascript: reduce array of objects in array of properties object

3 Answers3