Force Monad #MayThe4thBeWithYou

1.js

var Force = { Skywalker, RegularFolk, of: Skywalker };

function Skywalker(v) {
  return { map, chain, ap };
  function map(fn) {
    return Skywalker(fn(v));
  }
  function chain(fn) {
    return fn(v);
  }
  function ap(monad) {
    monad.map(v);
  }
}

function RegularFolk() {
  return { map: RegularFolk, chain: RegularFolk, ap: RegularFolk };
}

2.js

var Anakin = Skywalker("Anakin");
var Luke = Anakin.map(x => "Luke");
var Leia = Anakin.map(x => "Leia");

function nonJedi(who) {
  if (who == "Rey") return Force.of(who);
  return RegularFolk(who);
}

Luke
.chain( () => nonJedi("Rey") )
.chain( () => nonJedi("George Lucas") )
.map( v => w => console.log("Han shot first.") )
.ap( Force.of("Chewbacca") );