luciano/clojure-koans
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Solve sequence comprehensions

Browse source
This commit is contained in:
Kenneth Kostresevic 2021-12-16 14:08:59 +01:00
parent a9c22921a5
commit c1f179948c
1 changed files with 6 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
src/koans/12_sequence_comprehensions.clj
View file

@ -3,7 +3,7 @@
(meditations
"Sequence comprehensions can bind each element in turn to a symbol"
(= __
(= '(0 1 2 3 4 5)
(for [x (range 6)]
x))
@ -12,20 +12,20 @@
(map (fn [x] (* x x))
(range 6))
(for [x (range 6)]
__))
(* x x)))
"And also filtering"
(= '(1 3 5 7 9)
(filter odd? (range 10))
(for [x __ :when (odd? x)]
(for [x (range 10) :when (odd? x)]
x))
"Combinations of these transformations is trivial"
(= '(1 9 25 49 81)
(map (fn [x] (* x x))
(filter odd? (range 10)))
(for [x (range 10) :when __]
__))
(for [x (range 10) :when (odd? x)]
(* x x)))
"More complex transformations simply take multiple binding forms"
(= [[:top :left] [:top :middle] [:top :right]
@ -33,4 +33,4 @@
[:bottom :left] [:bottom :middle] [:bottom :right]]
(for [row [:top :middle :bottom]
column [:left :middle :right]]
__)))
(list row column))))