add data to an object key array javascript code example

Example 1: map add key to object in array javascript

const newArr = [
  {name: 'eve'},
  {name: 'john'},
  {name: 'jane'}
].map(v => ({...v, isActive: true}))

Example 2: javascript push object into array with variable key

//Normal Javascript
var key = "happyCount";
var obj = {};
obj[key] = someValueArray;
myArray.push(obj);

//OR

//If you're able to use ES6 and Babel, you can use this new feature:

{
    [yourKeyVariable]: someValueArray,
}