blairmitchelmore.com

I recently watched most of the Structure and Interpretation of Computer Programs (SICP) lectures and along the way I learned about the completely data-less representation available for Lisp's cons car and cdr functions. It was pretty mind blowing and just so I could feel smart for a couple minutes I ported it to Javascript, a language with almost all of Lisp's cool features but with C's syntax.

function cons(x, y) {
  return function(m) {
    m(x, y);
  };
}

function car(x) {
  x(function(a,d) {
    return a;
  });
}

function cdr(x) {
  x(function(a,d) {
    return d;
  });
}