find index of key in array of objects in javaScript

Question

Suppose I have an array of objects:

var a = [
    {id: "1", "name": "ABC"}, 
    {id: "2", "name": "XYZ"},
    {id: "3", "name": "PQR"},
    {id: "4", "name": "JKL"}
];

I need to find the index of object which has the key "id: '3' " in it. Is there any way to find the index of the object using underscore library? I have achieved this using for loop, but want to know an easier approach.

_.findIndex perhaps?

Gruff Bunny
– Gruff Bunny

2015-12-11 19:52:41 +00:00
Commented Dec 11, 2015 at 19:52 — Gruff Bunny
– Gruff Bunny, Commented Dec 11, 2015 at 19:52

Oriol · Accepted Answer · 2015-12-11 19:50:10Z

1

In ECMAScript 6 you can use findIndex:

[
    {id: "1", "name": "ABC"}, 
    {id: "2", "name": "XYZ"},
    {id: "3", "name": "PQR"},
    {id: "4", "name": "JKL"}
].findIndex(o => o.id === "3"); // 2

Similarly, underscore also has _.findIndex:

_.findIndex([
    {id: "1", "name": "ABC"}, 
    {id: "2", "name": "XYZ"},
    {id: "3", "name": "PQR"},
    {id: "4", "name": "JKL"}
], function(o){ return o.id === "3"}); // 2

answered Dec 11, 2015 at 19:50

Oriol

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