clojure-koans/src/koans/lazy_sequences.clj

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2011-03-31 13:11:27 +00:00
(meditations
"There are a wide range of ways to generate a sequence"
(= __ (range 1 5))
"The range starts at the beginning by default"
(= __ (range 5))
"It's important to only take what you need from a big sequence"
(= [0 1 2 3 4 5 6 7 8 9]
(take __ (range 100)))
"You can also limit results by dropping what you don't need"
(= [95 96 97 98 99]
(drop __ (range 100)))
"Iteration provides an infinite lazy sequence"
(= __ (take 20 (iterate inc 0)))
"Repetition is key"
(= [:a :a :a :a :a :a :a :a :a :a ]
(repeat 10 __))
"Iteration can be used for repetition"
(= (repeat 100 :foo)
(take 100 (iterate ___ :foo))))