https://clojure.org/news/2021/03/18/apis-serving-people-and-programs

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Keyword argument functions now also accept maps



Keyword argument functions now also accept maps

18 March 2021
Fogus

To date, Clojure's support for keyword arguments forces programmers
to choose between creating APIs that better support people (accepting
keyword args) or APIs that better support programs (by taking a map
of those args).

Introduced in Clojure 1.11, a function specified to take keyword
arguments may be passed a single map instead of or in addition to
(and following) the key/value pairs. When a lone map is passed, it is
used outright for destructuring, else a trailing map is added to the
map built from the preceding key/values via conj. For example, a
function that takes a sequence and optional keyword arguments and
returns a vector containing the values is defined as:

(defn destr [& {:keys [a b] :as opts}]
  [a b opts])

(destr :a 1)
->[1 nil {:a 1}]

(destr {:a 1 :b 2})
->[1 2 {:a 1 :b 2}]

In Clojure 1.11 the call to destr accepts a mixture of key/value
pairs and/or a lone (or trailing) map benefitting both programmer and
program.

This enhancement is available now in org.clojure/clojure
"1.11.0-alpha1".

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