Build an array of arrays from an array using REDUCE in javascript

Question

Input data

const users = [{id: 1, name: 'Madou', age: 37},
  {id: 2, name: 'Fatoumata', age: 33},
  {id: 3, name: 'Amadou', age: 31}];

Output [ [ 1, 'Madou', 37 ], [ 2, 'Fatoumata', 33 ], [ 3, 'Amadou', 31 ] ]

I implemented this:

const _data = users.map((item) => {
  return Object.keys(item).map((value) => item[value]);
});
console.log(_data);

But I want to use REDUCE instead, but I don't have any how to do it

Why? `.map` is *much* more appropriate than `.reduce` for your task — CertainPerformance, Apr 18 '22 at 07:35
Yes indeed, even with ```.map```, I don't know how to do it efficiently — Motra, Apr 18 '22 at 07:38
@deceze, It's true that I haven't done a comparative study between ```.map``` and ```.reduce```, but the way I implemented it seems a bit cumbersome to me. — Motra, Apr 18 '22 at 07:49
That's because it is, yes. And `reduce` would make it even more so. See uminder's answer below, it hardly gets any more concise than that. — deceze, Apr 18 '22 at 07:50
Thank you all for your help, ```Object.values(item)``` does the trick — Motra, Apr 18 '22 at 07:59

uminder · Accepted Answer · 2022-04-18T08:18:44.810

2

You can use Array.map() as follows:

const users = [{id: 1, name: 'Madou', age: 37},
  {id: 2, name: 'Fatoumata', age: 33},
  {id: 3, name: 'Amadou', age: 31}];
  
const result = users.map(o => Object.values(o));

console.log(result);

edited Apr 18 '22 at 08:18

answered Apr 18 '22 at 07:42

uminder

23,831
5
37
72

we can use your proposition if we know the KEYs, which is not my case. But it is true that I did not specify it in my comments – Motra Apr 18 '22 at 08:07
`@Mota`: I changed my answer accordingly. – uminder Apr 18 '22 at 08:19

score 0 · Answer 2 · answered Apr 18 '22 at 07:40

0

const _data = users.reduce((acc, { id, name, age }) => {
  acc.push([id, name, age]);
  return acc;
}, []);

answered Apr 18 '22 at 07:40

Ilya Dudarek

56
4

Your answer could be improved by adding more information on what the code does and how it helps the OP. – Tyler2P Apr 18 '22 at 10:58

Build an array of arrays from an array using REDUCE in javascript

2 Answers2