What is the best way to find index of object from array of objects - javascript

Question

Hi I'm trying to find index of an object using key name.

This is how i tried to get index:

var Obj = [
 {
 BData: [
 {id: '1', name: 'C'},
 {id: '2', name: 'Java'},
 ]
 },
 {
 CData: [
 {ccode: '010', cname: 'US'}
 ]
 },
 {
 PData: [
 {id: '21', pname: 'pen'}
 ]
 }
];
var index = Obj.findIndex(x => x.CData);

with above snippet from out side I am able to get index, but from in actual implementation getting -1, even though key exist also. Data also similar to above only but not getting the reason.

• shrys: you could try comparing it with undefined var index = Obj.findIndex(x => typeof x.CData !== 'undefined');.In the above case it is difficult to guess why you're getting -1

Answer 1

You have Array of objects which have indexes like 0, 1, 2.

x => x.CData won't return anything. So you need to find index of 'CData' as key of object inside that array.

Obj.findIndex(x => Object.keys(x).indexOf('CData') > -1 )

Please try this way. Hope this helps.

Answer 2

findIndex() method returns the index, if the function returns true, currently you are not returning anything. So modify your code like this: var index = Obj.findIndex(x => {return x.CData});