How to fill one object with the properties of another?

Question

JavaScript

There is an initial object:
obj1 = {a: 1, b: [], c: 'str'}
It is necessary to fill in all the properties of the second object into it:
obj2 = {a: 2, c: 'new str', d: 123}
To get either
{a: 2, b: [], c:'new str'}
or
{a: 2, b: [], c:'new str', d: 123}
What is the easiest way to do this?

Answer 1

Something like this:
https://jsfiddle.net/qjszwq0h/