what is the difference between calling function in JavaScript with or without parentheses ()

Question

so a simple example would be

function a() {
    alert(\"something\");
}

anything.onclick = a; // this is without parentheses

anything.onclick = a(); // th         


        

Answer 1

The parenthesis at the end of the function is the permission for js engine to execute the function. If you don't supply it, it won't be executed at all.

x=a() //if you do this you are invoking the function but if u just pass "a" you are passing a pointer to a function