Array of Json indexing in Javascript

Question

Having such an object

obj = [{id:1, val:"blabla"}, {id:2, val:"gnagna"}]

How can we index obj with id like obj[id==1] (Pandas Pythonic way).

I assume the followings:

Objects inside the array all have ids.
The first appearing id that matches is taken, assuming other objects matching are equal.

Your question lacks precision. Consider editing it by adding context, code, etc ... See How to create a Minimal, Complete, and Verifiable example. — Zenoo
– Zenoo, Commented Apr 16, 2018 at 8:09
What do you mean with "index it"? Do you want to access the objects (e.g. {id:1, val:"blabla"}) by their id? — x-ray
– x-ray, Commented Apr 16, 2018 at 8:10

Sebastian Speitel · Accepted Answer · 2018-04-16 08:11:12Z

5

You can use the find() method to find an item on a specific condition, defined in the callback.

The callback in this case would be

function f(i){return i.id === 1}

or using an arrow function:

i => i.id === 1

var obj = [{
  id: 1,
  val: "blabla"
}, {
  id: 2,
  val: "gnagna"
}]

var item = obj.find(i => i.id === 1);
console.log(item);

answered Apr 16, 2018 at 8:11

Sebastian Speitel

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Moti Korets · Accepted Answer · 2018-04-16 08:13:14Z

4

You can use find method for that. obj.find( o => o.id == index)

obj = [{id:1, val:"blabla"}, {id:2, val:"gnagna"}] 

function getBy(index){
return obj.find( o => o.id == index)
}

console.log(getBy(1))
console.log(getBy(2))

edited Apr 16, 2018 at 8:13

answered Apr 16, 2018 at 8:10

Moti Korets

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1 Comment

Tushar Over a year ago

find as there will be only one element.

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