[Solved] create a function that will add numbers together when called in succession [closed]

by


Thanks to @ermouth for initial code.

var add = (function() {
    var factory = function(value) {
        var fn = function(num) {
            return factory(value + num);
        };
        // This is the main hack: 
        // We will return a function that when compared / concatted will call .toString and return a number.
        // Never use this in production code...
        fn.toString = function() {
            return value;
        };
        return fn;
    };
    return factory(0);
})();

add(1); // 1
add(1); // 1
add(1)(2); // 3
add(1)(2)(3); // 6

But beware of equal comparation:

add(2) == add(2) // false
add(2) > add(1) // true
add(2) < add(1) // false

2

solved create a function that will add numbers together when called in succession [closed]