How to achieve arbitrary chain on function call in javascript? [duplicate]

Answer 1

As user codebox already said: This is not possible.

What you can do instead is to take the current parameter of the function into account. If there is no parameter you can return the result:

sum(1)(2)() == 3

Here is the implementation:

var sum = (function() {
    var total = 0;
    return function add(a) {
        if(a === undefined) {
            return total;
        }
        total += a;
        return add;
    };
}());