How to insert a new key value to the existing JSON object array?

Question

I have the below JSON array,

const data = [{id:1,name:'a'},{id:2,name:'b'},{id:3,name:'c'}]

and I have to insert one more property to each object, and expected result would be like this.

const data = [{id:1,name:'a',selected:false},{id:2,name:'b',selected:false},{id:3,name:'c',selected:false}]

I'm trying to achieve this javascript only.

Please help me on this.

Answer 1

The question did not reach the standards of Stackoverflow, but from your comments, I believe that you are seriously looking for a solution's than your reputation.

The answer is kind of simple old-school method, please refer and give a try. Thanks.

 const data = [{id:1,name:'a',selected:false},{id:2,name:'b',selected:false},{id:3,name:'c',selected:false}] data.forEach((element,index) => { element["selected"] = false, element["test"]=index+1 // any key-value pairs }); console.log(data)

Answer 2

A simple loop is all you need.

for (let item of data) {
  item.selected = false;
}

On each iteration of this loop, item becomes the next item from the iterated object ( data , in this case). Since the array still references these same objects, you can modify item , and this modification also appears on the item in data ... again because it is the same object.

Answer 3

var data = [{id:1,name:'a'},{id:2,name:'b'},{id:3,name:'c'}];

for (i = 0; i < data.length; i++) { 
   // add the addition property using dot notation
   data[i].selected = 'false';
}

// output to console the updated data
   console.log(data);