js using a variable as a key code example

Example 1: use value of variable as key javascript

var final = [{
  id: 23477234
}];


//add new object to the array using variables as keys AND values
var newArrray = {};
var key = "name";
var value = "John";
newArrray[key] = value;
final.push(newArrray);

/*
final now equals

[{
  id: 23477234,
  name: "John"
}]

*/

Example 2: how to use variable in js key

ES6 defines ComputedPropertyName
var thetop = "top",
    obj = { [thetop]: 10 };

console.log(obj.top); // -> 10