Curry function with any numbers og arguments

curry.js

var curry = function(fn) {

    var _subCurry = function(fn) {
        var args = [].slice.call(arguments, 1);

        return function () {
            return fn.apply(this, args.concat([].slice.call(arguments)));
        };
    };

    var _curry = function(fn, length) {
        return function () {
            if (length - arguments.length > 0) {
                return _curry(
                    _subCurry.apply(this, [fn].concat([].slice.call(arguments))),
                    length - arguments.length
                );
            }
            return fn.apply(this, arguments);
        }
    };

    return _curry(fn, fn.length)();
};

var func = curry(function (a, b, c, d) {
    return a * b + c * d;
});

console.log(func(10)(2)(5)(3));
console.log(func(10)(2)(5, 3));
console.log(func(10)(2, 5)(3));
console.log(func(10)(2, 5, 3));
console.log(func(10, 2)(5, 3));
console.log(func(10, 2, 5)(3));
console.log(func(10, 2, 5, 3));

// TODO: holes