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sequence comprehensions done

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Oli Clive-Griffin 2021-06-03 20:47:31 +12:00
parent 8d6d9b0ecf
commit cc74c04aec
1 changed files with 6 additions and 6 deletions
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12
src/koans/12_sequence_comprehensions.clj
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@ -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]]
__)))
[row column])))