Exceptions indicated.
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)
;; => nil
The Maybe monad implementation and helpers functions
for working with maybe related types.
(require '[cats.monad.maybe :as maybe])
(maybe/just 1)
;; => nil
cat-maybesclj/s
(cat-maybes coll)Given a collection of maybes, return a sequence of the values that the just's contain.
Given a collection of maybes, return a sequence of the values that the just's contain.
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
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.
map-maybeclj/s
(map-maybe mf coll)Given a maybe-returning function and a collection, map the function over the collection returning the values contained in the just values of the resulting collection.
Given a maybe-returning function and a collection, map the function over the collection returning the values contained in the just values of the resulting collection.
maybeclj/smacro
(maybe default m f)Given a default value, a maybe and a function, return the default if the maybe is a nothing; if its a just, apply the function to the value it contains and return the result.
Given a default value, a maybe and a function, return the default if the maybe is a nothing; if its a just, apply the function to the value it contains and return the result.
maybe->seqclj/s
(maybe->seq m)Given a maybe, return an empty seq if its nothing or a one-element seq with its value if its not.
Given a maybe, return an empty seq if its nothing or a one-element seq with its value if its not.
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.
seq->maybeclj/s
(seq->maybe coll)Given a collection, return a nothing if its empty or a just with its first element if its not.
Given a collection, return a nothing if its empty or a just with its first element if its not.
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