How to add a new property in object in javascript

Question

I have one obj like

var obj = {
        name : "Jenny",
        roll : "1000"
}

Now I want to add a new property in obj called grade.

after that my object looks like

var obj = {
        name : "Jenny",
        roll : "1000",
        grade :"7"
}

I am not getting any method from obj obj[op]=value. How to achive that.

When using bracket notation, wrap the property key in quotes. `obj.grade = '7';` or `obj['grade'] = '7';` — Tushar, Oct 19 '16 at 07:26

score 4 · Accepted Answer · answered Oct 19 '16 at 07:29

4

It is an object so you can not do obj[op] = value

Instead you can do obj.op = value

In this case, obj.grade = 7 will serve the purpose.

answered Oct 19 '16 at 07:29

Ani

score -1 · Answer 2 · answered Oct 19 '16 at 07:29

-1

You can do this.

   Object.defineProperty(obj, 'grade', {
      value: '7'
    });

answered Oct 19 '16 at 07:29

Fida

Would you please explain why would you downvote this? – Fida Oct 19 '16 at 09:40

2 Answers2