monad 0.5.5

practical monad implementation in dart-language.

DartyMonad

My dirty darty implementations of Monads.

Monads

ConditionalMonad<T>

You can write short-circuit evaluational snipet like below.

var tf = ConditionalMonad(42)
  .fand((i) => i % 2 == 0)    // true, it's evaluated.
  .fand((i) => i % 3 == 0)    // true, it's evaluated.
  .fand((i) => i % 4 == 0)    // false, it's evaluated.
  .fand((_) => true)          // Of course true, but it's NEVER evaluated.
  .run()
;
print(tf);    // => false

You may think it is too redundant.
Right, we can write similar code just by using && operator.

var tf = ((int i) => 
     (i % 2 == 0)    // true, it's evaluated.
  && (i % 3 == 0)    // true, it's evaluated.
  && (i % 4 == 0)    // false, it's evaluated.
  && true            // Of course true, but it's NEVER evaluated.
)(42);
print(tf);    // => false

ConditionalMonad has advantage if it is used as argument.

doSomething(ConditionalMonad<int> Function(int) makeMonad) {
  var tf = makeMonad(42).run();     // short-circuit is guaranteed.
  print(tf);
}

License

MIT

Auther

Loui Sakaki