Haskell Lens library (operators and functions)1.28MB. 0 audio & 15 images. Updated 2014-04-26.
Sample (from 21 notes)
|Back||Perform a monadic action, e.g. ["hello", "world"] ^! traverse.act putStrLn will print both strings|
|Back||Return Just first target or Nothing, e.g. "world" ^? ix 3 == Just 'l', Left 4 ^? _Right == Nothing|
|Back||Modify all targets of a lens or traversal with a function, e.g. over mapped (*10) [1, 2, 3] == [10, 20, 30]|
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