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johnmcclean-aol edited this page Nov 23, 2016 · 10 revisions

The Maybe type in cyclops-react is a totally lazy Option or Optional type modelled on Maybe from Haskell. Maybe's can represent one of two states - Just a value (present / some ) or None.

Class Hiearchy

Maybe is an instance of the following cyclops types (and others) ApplicativeFunctor, Filterable, Foldable, Functor, MonadicValue1, To, Value,Visitable and Zippable

Pattern matching

In cyclops we can use the visit operator to pattern match on the state the Maybe is in.

int result = Maybe.just(10)
                  .visit(some->some+5,()->-1); 

Recover / orElse /coflatMap

Sequence

Accumulating

Recursion

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