How can we get an array of values for a particular key, from a sequence of objects inside an array using Javascript

Question

I need to get an array of values for a particular key, from a sequence of objects inside an array using javascript.

Parent array

const a =[{employeeId: 033, field: "TAX", active: 1},
{employeeId: 035, field: "ACCOUNTING", active: 1},
 {employeeId: 035, field: "SALES", active: 1}];

Required output(array of values for the key named 'field')

["TAX","ACCOUNTING","SALES"]

```const output = a.map(el=>el.field);``` Just a simple map() — ikhvjs, Jul 12 '21 at 15:28
[How much research effort is expected of Stack Overflow users?](https://meta.stackoverflow.com/questions/261592/how-much-research-effort-is-expected-of-stack-overflow-users) — Andreas, Jul 12 '21 at 15:30

score 1 · Accepted Answer · answered Jul 12 '21 at 15:28

1

You can use Array#map.

const a =[{employeeId: 033, field: "TAX", active: 1},
{employeeId: 035, field: "ACCOUNTING", active: 1},
 {employeeId: 035, field: "SALES", active: 1}];
const res = a.map(x => x.field);
// or a.map(({field})=>field);
console.log(res);

answered Jul 12 '21 at 15:28

Unmitigated

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Please spend some with research if there isn't already a similar question, especially with such a common problem, instead of adding just another clone of an already available answer... – Andreas Jul 12 '21 at 15:31

score 1 · Answer 2 · answered Jul 12 '21 at 15:29

1

array.map transforms an array for you.

const a =[{employeeId: 033, field: "TAX", active: 1},
{employeeId: 035, field: "ACCOUNTING", active: 1},
 {employeeId: 035, field: "SALES", active: 1}];
 
 console.log(a.map((e) => e.field));

answered Jul 12 '21 at 15:29

Mario Varchmin

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How can we get an array of values for a particular key, from a sequence of objects inside an array using Javascript

2 Answers2