| ZVON > References > Haskell reference |
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| | Indexes | Syntax | >> Prelude << | Ratio | Complex | Numeric | Ix | Array | List | Maybe | Char | Monad | IO | Directory | System | Time | Locale | CPUTime | Random |
| Module: | Prelude |
|---|---|
| Function: | maybe |
| Type: | a -> (b -> a) -> Maybe b -> a |
| Description: | |
| Related: |
Input: maybe 5 negate (lookup 1 [(1,10),(2,20)])
Output: -10
Input: maybe 5 negate (lookup 9 [(1,10),(2,20)])
Output: 5