code snippets in http://liujiacai.net/blog/2016/02/22/recursion-without-name/

recursion_without_name.js

var Y = function(f) {
    return function(x) {
        return x(x)
    }(function (x) {
        return f(function(y) {
            return x(x)(y)
        })
    })
}     
var F = function(g) {
    return function(n) {
        if (n == 0) {
            return 1;
        } else {
            return n * g(n-1);
        }
  }
}
Y(F)(5)

recursion_without_name.scm

(define F
  (lambda (g)
    (lambda (n)
      (if (= n 0)
        1
        (* n (g (- n 1)))))))
(define Y 
  (lambda (f)
    ((lambda (x) (x x))
     (lambda (x) (f (lambda (y) ((x x) y)))))))

((Y F) 5)