Longest common prefix: Difference between revisions
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m (fix spelling of "interstellar" :)) |
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=={{header|Haskell}}== |
=={{header|Haskell}}== |
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This even works on infinite strings (that have a finite longest common prefix), due to Haskell's laziness. |
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<lang haskell>lcp :: (Eq a) => [[a]] -> [a] |
<lang haskell>lcp :: (Eq a) => [[a]] -> [a] |
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lcp = map head . takeWhile allEqual . truncTranspose where |
lcp = map head . takeWhile allEqual . truncTranspose where |
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print $ lcp [""] -- prints "" |
print $ lcp [""] -- prints "" |
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print $ lcp ["prefix","suffix"] -- prints "" |
print $ lcp ["prefix","suffix"] -- prints "" |
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print $ lcp ["foo","foobar"] -- prints "foo" |
print $ lcp ["foo","foobar"] -- prints "foo" |
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print $ lcp ["abc" ++ repeat 'd',"abcde" ++ repeat 'f'] -- prints "abcd"</lang> |
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=={{header|J}}== |
=={{header|J}}== |
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