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Solve lazy sequences

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This commit is contained in:
Kenneth Kostresevic 2021-12-15 15:10:10 +01:00
parent a9c22921a5
commit 85ffa5990c
1 changed files with 7 additions and 7 deletions
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14
src/koans/11_lazy_sequences.clj
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@ -3,26 +3,26 @@
(meditations
"There are many ways to generate a sequence"
(= __ (range 1 5))
(= '(1 2 3 4) (range 1 5))
"The range starts at the beginning by default"
(= __ (range 5))
(= '(0 1 2 3 4) (range 5))
"Only take what you need when the sequence is large"
(= [0 1 2 3 4 5 6 7 8 9]
(take __ (range 100)))
(take 10 (range 100)))
"Or limit results by dropping what you don't need"
(= [95 96 97 98 99]
(drop __ (range 100)))
(drop 95 (range 100)))
"Iteration provides an infinite lazy sequence"
(= __ (take 8 (iterate (fn [x] (* x 2)) 1)))
(= '(1 2 4 8 16 32 64 128) (take 8 (iterate (fn [x] (* x 2)) 1)))
"Repetition is key"
(= [:a :a :a :a :a :a :a :a :a :a]
(repeat 10 __))
(repeat 10 :a))
"Iteration can be used for repetition"
(= (repeat 100 "hello")
(take 100 (iterate ___ "hello"))))
(take 100 (iterate (fn [x] x) "hello"))))