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.

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 — shrys
– shrys, Commented Mar 16, 2020 at 7:35

Chintan Joshi · Accepted Answer · 2020-03-16 07:44:53Z

3

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.

answered Mar 16, 2020 at 7:44

Chintan Joshi

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Comments

Jishnu · Accepted Answer · 2020-03-16 07:51:42Z

0

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});

edited Mar 16, 2020 at 7:51

answered Mar 16, 2020 at 7:45

Jishnu

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