How to get a particular JSON element of an array?

Question

There is an array of JSONs :

var a = [ {id:1, latlong:[...]} , {id:2, latlong:[...]} , ... ];

How to get the JSON element which key id equals 2 for example ?

Possible duplicate: https://stackoverflow.com/questions/2722159/how-to-filter-object-array-based-on-attributes — seasick, Oct 14 '19 at 15:07
Please read: [How much research effort is expected of Stack Overflow users?](https://meta.stackoverflow.com/a/261593/3082296) — adiga, Oct 14 '19 at 15:11

score 0 · Answer 1 · answered Oct 14 '19 at 15:05

0

Check out the .filter method.

var a = [ {id:1, latlong:[...]} , {id:2, latlong:[...]} , ... ];
console.log(a.filter((item) => item.id === 2));

answered Oct 14 '19 at 15:05

seasick

score 0 · Answer 2 · answered Oct 14 '19 at 15:06

You can use array filter which will return an array of objects. Then use index (example [0] in this code) to retrieve the first object

var a = [{
  id: 1,
  latlong: ''
}, {
  id: 2,
  latlong: ''
}];

let newVal = a.filter(e => e.id === 2)[0];
console.log(newVal)

score 0 · Accepted Answer · answered Oct 14 '19 at 15:07

0

To find a single entry, there's the .find method:

const a = [ {id:1, latlong:[...]} , {id:2, latlong:[...]} , ... ];
const el = a.find((item) => item.id === 2);
console.log(el);

answered Oct 14 '19 at 15:07

tiagodws

3 Answers3