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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 |
|---|---|
| Operator: | (.) |
| Type: | (a -> b) -> (c -> a) -> c -> b |
| Priority: | 9 |
| Description: | function composition |
| Related: | |
| Keywords: | function composition |
| Bibliography: | FUNCTIONAL PROGRAMMING: Function Composition |
| MATHWORLD | Composition |
Input: (negate . abs) (-1)
Output: -1
Input: (reverse . take 10 . enumFrom) 10
Output: [19,18,17,16,15,14,13,12,11,10]
Input: (abs . snd)(-1,-3)
Output: 3
Input: ((2+).(3*).(4-)) 2
Output: 8