arguments.callee

function factorial(n) {
  return !(n > 1) ? 1 : factorial(n - 1) * n;
}

[1, 2, 3, 4, 5].map(factorial);

[1, 2, 3, 4, 5].map(function (n) {
  return !(n > 1) ? 1 : /* what goes here? */ (n - 1) * n;
});

[1, 2, 3, 4, 5].map(function (n) {
  return !(n > 1) ? 1 : arguments.callee(n - 1) * n;
});

var global = this;

var sillyFunction = function (recursed) {
  if (!recursed) {
    return arguments.callee(true);
  }
  if (this !== global) {
    alert("This is: " + this);
  } else {
    alert("This is the global");
  }
};

sillyFunction();

[1, 2, 3, 4, 5].map(function factorial(n) {
  return !(n > 1) ? 1 : factorial(n - 1) * n;
});

function f(a, b, c, d, e) {
  return a ? b * c : d * e;
}

function create() {
  return function (n) {
    if (n <= 1) return 1;
    return n * arguments.callee(n - 1);
  };
}

var result = create()(5); //  120 (5 * 4 * 3 * 2 * 1)

function createPerson(sIdentity) {
  var oPerson = new Function("alert(arguments.callee.identity);");
  oPerson.identity = sIdentity;
  return oPerson;
}

var john = createPerson("John Smith");

john();