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Haskellの遅延評価がわからない。
これの実行結果 before
testBEFORE
after
AFTER
after
AFTER なんでこうなるの……。
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| import Data.Char | |
| main = do | |
| contents <- getContents | |
| putStr "test" | |
| putStr $ map toUpper contents |
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結論
実行環境の問題でした。
Linuxのターミナルにて実行した場合、そちらでバッファされてしまうためプログラムが関与できないらしい。