Ajax Monad

ajax_monad.js

function Monad() {
  var prototype = Object.create(null);
  function unit(value) {
    var monad = Object.create(prototype);
    monad.bind = function(func, args) {
      return func.apply(undefined, [value].concat(Array.prototype.slice.apply(args || [])));
    }
    return monad;
  }
  unit.lift = function(name, func) {
    prototype[name] = function(...args) {
      return unit(this.bind(func, args));
    };
    return unit;
  };
  unit.method = function(name, func) {
    prototype[name] = func;
    return unit
  }
  return unit;
}
=========
var ajax = MONAD().lift('alert', alert);
var monad = ajax('Hello world.');
monad.bind(alert);
monad.alert();

Props to Douglas Crockford "Monads and Gonads".