fixed point in JavaScript

ycombinator.js

// An example from http://matt.might.net/articles/implementation-of-recursive-fixed-point-y-combinator-in-javascript-for-memoization/
var Y = function (F) {
  return (function (x) {
	return F(function (y) { return (x(x))(y);});
  }(function (x) {
	return F(function (y) { return (x(x))(y);});
  }));
};