Option monad in JavaScript without using an Array.

option_monad_2.js

function Some(value) {
  this.value = value;
}

Some.prototype.bind = function(f) {
  return f(this.value);
}

function None() { 
}

None.prototype.bind = function(f) {
  return this;
}

var a = new Some(42);
var b = new None;
var c = new Some(100);

a.bind(function(valueA) {
  return b.bind(function(valueB) {
    return c.bind(function(valueC) {
      return new Some(valueA + valueB + valueC);
    })
  })
});

a.bind(function(valueA) {
  return c.bind(function(valueC) {
    return new Some(valueA + valueC);
  })
});