Simple proof-of-concept lenses implementation in Clojure
(ns ...
(:require [rocks.clj.lenses.core :refer [lens-values
lens-keys
in
out
out-all
map
->
->>]]))
(-> {:data {:foo [1 2 3]
:bar {:baz 1
:qux 2}}}
(in :data) ;; zoom into data
(in :foo) ;; zoom into :foo
(conj 4) ;; add 4 to [1 2 3]
(in 0) ;; zoom into first element of array
(+ 5) ;; 5 to first element of array
out ;; zoom out
out ;; zoom out
(in :bar) ;; zoom into :bar
(assoc :tux 3) ;; add :tux -> 3 mapping
lens-values ;; zoom into values
(map inc) ;; increment all values
out ;; zoom out
lens-keys ;; lens in keys
(map name) ;; convert all keywords to strings
out-all ;; zoom outmost
)
=> {:data {:foo [6 2 3 4]
:bar {"baz" 2
"qux" 3
"tux" 4}}}Copyright © 2018 Eduard Knyshov
Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.