recursive IIFEs

recursiveIIFE.coffee

upperCase = (str, cb) ->
  do fn = (err, str) ->
    if err
      cb err
    
    else if typeof str is 'function'
      str fn # fn is this function, as of 1.2.1-pre

    else
      str = String str
      cb null, str.toUpperCase()

recursiveIIFE.js

upperCase = function(str, cb) {
    var fn;
    return (fn = function(err, str) {
      if (err) {
        return cb(err);
      } else if (typeof str === 'function') {
        return str(fn);
      } else {
        str = String(str);
        return cb(null, str.toUpperCase());
      }
    })(err, str);
  };
}

here's how i'd write it in javascript:

function upperCase(str, cb) {
  return function fn(err, str) {
    return err ? cb(err) :

    typeof str === 'function' ? str(fn) :

    cb(null, String(str).toUpperCase())
  }(null, str)
}