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function factorial(n) {
    function fact(n,res) {
        if (n < 2) return res;

        return fact( n - 1, n * res );
    }

    return fact( n, 1 );
}

factorial( 5 );     // 120

// original factorial
function factorial(n) {
  if (n < 2) return 1;
  
  return n * factorial(n-1);
}

// ES6
const _sum = accu => ([first, ...rest]) =>
  first === undefined ? accu : _sum(first + accu)(rest)

const sum = (...vals) => _sum(0)(vals)

var hanoi = function (discNum, src, aux, dst) {
    if (discNum > 0) { // 1. make the last one of disc be seen.
        hanoi(discNum - 1, src, dst, aux); // move all disc to Aux until last one is seen.

        console.log("move disc [" + discNum + "] from " + src + " to " + dst);

        hanoi(discNum - 1, aux, src, dst); // move the last one of src to dst
    }
};

hanoi(3, "src-panel", "aux-middle", "dst-panel");

var ninja = {
    chirp: function signal(n) {
        return n > 1 ? signal(n - 1) + "-chirp" : "chirp";
    }
};
assert(ninja.chirp(3) == "chirp-chirp-chirp",
    "Works as we would expect it to!");
var samurai = {
    chirp: ninja.chirp
};
ninja = {};
assert(samurai.chirp(3) == "chirp-chirp-chirp",
    "The method correctly calls itself.");

function trampoline(func /*, args */ ) {
    var rest = Array.prototype.slice.call(arguments, 1),
        result = func.apply(func, rest);

    while (typeof result === "function") {
        result = result();
    }
    return result;
}

// ES6 rewrite
//      NOTE: this seems to have issue when the func is partialled
const trampoline = (func, ...vals) => {
    let result = func.apply(func, vals);
    while (typeof result === "function") {
        result = result();
    }
    return result;
}

//test