igstan

// `unit` is `return` from Haskell
// `bind` is `>>=` from Haskell, or `flatMap` from Scala

var None = {
  bind:      function (fn)        { return this;      },
  unit:      function (v)         { return Option(v); },
  getOrElse: function (elseValue) { return elseValue; }
};

var Some = function (value) {