Functor(T)

abstract struct Monads::Functor(T)

The root abstraction. A functor is anything you can fmap over.

Methods

fmap(lambda : T -> U)

Abstract. Transforms the wrapped value of type T into a value of type U, returning a functor of the same kind. Implemented by each concrete type.

fmap(&block : T -> U)

Block form of fmap. Forwards the block to the lambda overload.

Monads::Just.new(5).fmap { |x| x * 2 } # => Just(10)