CurryInfo: base-3.4.0 / Prelude.lookup
definition: 
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lookup :: Eq a => a -> [(a, b)] -> Maybe b
lookup _ [] = Nothing
lookup k ((x,y):xys) | k == x = Just y
| otherwise = lookup k xys
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demand:
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argument 3 |
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deterministic:
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deterministic operation |
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documentation:
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Looks up a key in an association list. |
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failfree:
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(_, _, _) |
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indeterministic:
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referentially transparent operation |
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infix:
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no fixity defined |
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iotype:
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{(_,_,{[]}) |-> {Nothing} || (_,_,{:}) |-> {Just,Nothing}}
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name:
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lookup |
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precedence:
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no precedence defined |
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result-values:
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{Just,Nothing}
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signature:
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Eq a => a -> [(a, b)] -> Maybe b |
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solution-complete:
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operation might suspend on free variables |
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terminating:
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yes |
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totally-defined:
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possibly non-reducible on same data term |