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elderica/foldl-prime.hs

Created December 24, 2011 03:09
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再帰の書き方のメモ．正格評価を使い，その場で結果に変換する．作者ujihisa氏（@ujm)
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foldl-prime.hs
foldl' _ x [] = x
foldl' op x (y:ys) = let !z = x `op` y in foldl' op z ys
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