Can Clojure implement (g ∘ f) constructions like Haskell's g . f
? I'm currently using workarounds like (fn [n] (not (zero? n)))
, which isn't nearly as nice :)
There is a function to do this in clojure.core
called comp
. E.g.
((comp not zero?) 5) ; => true
You might also want to consider using ->
/ ->>
, e.g.
(-> 5 zero? not) ; => true
You can use Clojure's reader-macro shortcut for anonymous functions to rewrite your version in fewer keystrokes.
user=> (#(not (zero? %)) 1) true
For the specific case of composing not
and another function, you can use complement
.
user=> ((complement zero?) 1) true
Using not
in combination with when
and if
is common enough that if-not
and when-not
are core functions.
user=> (if-not (zero? 1) :nonzero :zero) :nonzero
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