how to add new key value in array of object in javascript code example

Example: js key value array

var myArray = {id1: 100, id2: 200, "tag with spaces": 300};
myArray.id3 = 400;
myArray["id4"] = 500;

for (var key in myArray) {
  console.log("key " + key + " has value " + myArray[key]);
}