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cats.monad.maybe
The Maybe monad implementation and helpers functions for working with maybe related types.
(require '[cats.monad.maybe :as maybe])
(maybe/just 1)
;; => #<Just [1]>
The Maybe monad implementation and helpers functions
for working with maybe related types.
(require '[cats.monad.maybe :as maybe])
(maybe/just 1)
;; => #<Just [1]>
from-maybeclj/s
(from-maybe mv)(from-maybe mv default)Return inner value from maybe monad.
This is a specialized version of cats.core/extract
for Maybe monad types that allows set up
the default value.
Let see some examples:
(from-maybe (just 1))
;=> 1
(from-maybe (nothing))
;=> nil
(from-maybe (nothing) 42)
;=> 42
Return inner value from maybe monad.
This is a specialized version of `cats.core/extract`
for Maybe monad types that allows set up
the default value.
Let see some examples:
(from-maybe (just 1))
;=> 1
(from-maybe (nothing))
;=> nil
(from-maybe (nothing) 42)
;=> 42
justclj/s
(just)(just v)A Just type constructor.
Without arguments it returns a Just instance with nil as wrapped value.
A Just type constructor. Without arguments it returns a Just instance with nil as wrapped value.
just?clj/s
(just? v)Returns true if v is an instance
of Just type.
Returns true if `v` is an instance of `Just` type.
maybe-transformerclj/s
(maybe-transformer inner-monad)The maybe transformer constructor.
The maybe transformer constructor.
maybe?clj/s
(maybe? v)Return true in case of v is instance
of Maybe monad.
Return true in case of `v` is instance of Maybe monad.
nothing?clj/s
(nothing? v)Returns true if v is an instance
of Nothing type or is nil.
Returns true if `v` is an instance of `Nothing` type or is nil.
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