Iterate over object and add property to each object code example

Example 1: javascript loop through object

for (var property in object) {
  if (object.hasOwnProperty(property)) {
    // Do things here
  }
}

Example 2: loop an object in javascript

var obj = { first: "John", last: "Doe" };

Object.keys(obj).forEach(function(key) {
    console.log(key, obj[key]);
});