Calling a function without parentheses returns whole function as a string

Question

I created a JavaScript object like this:

var obj = {
  a: 10,
  b: 20,
  add: function(){
     return this.a + this.b;
  }
};

I executed the

Answer 1

You must use () to call a function in JavaScript.

If you do not use parenthesis, you are simply referencing the function, which can be useful in a case where you would like to pass a function to another code block for deferred execution.

In your situation, because you wish to call add right away, you should be sure to use ()

obj.add();