Y-Combinator in Bike

ycombinator.bk

var Y = func(h) {
    return func(f) {
        f(f)
    }(func(f) {
        h(func(n) { f(f)(n) })
    });
};

var fact = Y(func(recur) {
    return func(n) {
        n == 1 ? 1 : n * recur(n-1)
    };
});

println(fact(5));