inFullMobile Language Wars: Round 1 - Old JavaScript Solution 1 by @rsp - See: https://gist.github.com/rsp/d8bdbafa09f24f99eebc8ed60fe205c8

ifm-lw-r1-ojs-solution-1.js

function f(x) {
  return function (y) {
    return function (z) {
      var r = z;
      for (var i = 1; i++ < x(function (a) { return a + 1; })(0); r = y(r));
      return r;
    };
  };
}