Maybe Monad

maybe_monad.js

function MONAD(modifier) {
  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 || [])));
    };
    if (typeof modifier === 'function') {
      modifier(monad, value);
    }
    return monad;
  }
  return unit;
}

=======
var maybe = MONAF(function (monad, value) {
  if (value === null || value === undefined) {
    monad.is_null = true;
    monad.bind = function() {
      return monad;
    }
  }
}

var monad = maybe(null);
monad.bind(alert);