how double parantheses ()() workes in JavaScript?

Question

Here i have a question regarding Double parentheses, can anyone please explain me how does it works.

function counter() {
  console.log("hI");
  return function (){
    console.log("inside hI");
  }
}    
counter()();

Answer 1

In your example counter returns a function, so having parentheses after the call to counter calls the function that counter returns