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function sum() {
    var s = Array.prototype.reduce.call(arguments, function (x, y) { return x + y; }, 0);
    var f = function () {
        var a = Array.prototype.slice.call(arguments);
        a.push(s);
        return sum.apply(null, a);
    };
    f.valueOf = function () { return s; };
    return f;
}

sum(1,2,3,4);
sum(1)(2)(3);
sum(1,2)(3);