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yokolet/right-and-left.clj

Created March 30, 2014 04:26
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another trampoline example for ClojureBridge CommunityDocs
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right-and-left.clj
(defn right-and-left [size]
(letfn
[(go-right [x [start end]]
(cond
(< (inc x) end) (do #_(println "right") (go-right (inc x) [start end]))
(> (dec x) start) (go-left x [start (dec end)])
:else (println "done")))
(go-left [x [start end]]
(cond
(> (dec x) start) (do #_(println "left") (go-left (dec x) [start end]))
(< (inc x) end) (go-right x [(inc start) end])
:else (println "done")))]
(go-right 0 [0 size])))
(defn right-and-left2 [size]
(letfn
[(go-right [x [start end]]
#(cond
(< (inc x) end) (do #_(println "right") (go-right (inc x) [start end]))
(> (dec x) start) (go-left x [start (dec end)])
:else (println "done")))
(go-left [x [start end]]
#(cond
(> (dec x) start) (do #_(println "left") (go-left (dec x) [start end]))
(< (inc x) end) (go-right x [(inc start) end])
:else (println "done")))]
(trampoline go-right 0 [0 size])))
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