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Ingy döt Net 2013-10-27 22:24:23 +00:00
parent 6f050a029e
commit 776bba907c
3887 changed files with 59894 additions and 7280 deletions
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3
Task/Generator-Exponential/Clojure/generator-exponential-1.clj Normal file
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(defn powers [m] (for [n (iterate inc 1)] (reduce * (repeat m n)))))
(def squares (powers 2))
(take 5 squares) ; => (1 4 9 16 25)

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Task/Generator-Exponential/Clojure/generator-exponential-2.clj Normal file
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(defn squares-not-cubes
([] (squares-not-cubes (powers 2) (powers 3)))
([squares cubes]
(loop [[p2first & p2rest :as p2s] squares, [p3first & p3rest :as p3s] cubes]
(cond
(= p2first p3first) (recur p2rest p3rest)
(> p2first p3first) (recur p2s p3rest)
:else (cons p2first (lazy-seq (squares-not-cubes p2rest p3s)))))))
(->> (squares-not-cubes) (drop 20) (take 10))
; => (529 576 625 676 784 841 900 961 1024 1089)

6
Task/Generator-Exponential/Clojure/generator-exponential-3.clj Normal file
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(defn seq->fn [sequence]
(let [state (atom (cons nil sequence))]
(fn [] (first (swap! state rest)))
(def f (seq->fn (squares-not-cubes)))
[(f) (f) (f)] ; => [4 9 16]