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

Answer 1

You can't do this - how does the sum function know whether you want it to return the answer or another function?

You could do something along these lines though:

sum(0)(1)(2)(3).result()

Implemented like this:

var sum = (function(){
    var total = 0;
    var f = function(n){
        total += n;
        return f;
    };
    f.result = function(){
        return total;
    };
    return f;
}());