Add key/value pair to object inside an object-Javascript

Question

I want to add a key/value pair inside an object. My object looks like this:

obj = {
   obj1: {
      a: 1,
      b:2,
      c:3
    },
    obj2:{
      a: 1,
      b:2,
      c:3
    },
    obj3:{
      a: 1,
      b:2,
      c:3
    }
}

Now above every sub-objects, I want to add a key/value pair, say: d:4 and it should look like:

 obj = {
   obj1: {
      a: 1,
      b:2,
      c:3,
      d:4
    },
    obj2:{
      a: 1,
      b:2,
      c:3,
      d:4
    },
    obj3:{
      a: 1,
      b:2,
      c:3,
      d:4
    }
}

xianshenglu · Accepted Answer · 2018-02-10 05:43:59Z

2

one line:

Object.getOwnPropertyNames(obj).forEach(p => obj[p].d = 4);

answered Feb 10, 2018 at 5:43

xianshenglu

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1 Comment

RaphaMex Over a year ago

Object.getOwnPropertyNames() is the way.

Tallboy · Accepted Answer · 2018-02-10 04:20:59Z

2

This will do it:

for (var o in obj) {
  if (obj.hasOwnProperty(o)) {
    obj[o]['d'] = 4;
  }
}

answered Feb 10, 2018 at 4:20

Tallboy

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