filter -zlib -containers

filter, applied to a predicate and a list, returns the list of those elements that satisfy the predicate; i.e., > filter p xs = [ x | x <- xs, p x]

filterM :: Monad m => (a -> m Bool) -> [a] -> m [a]

base Control.Monad

This generalizes the list-based filter function.

filter :: (Char -> Bool) -> ByteString -> ByteString

bytestring Data.ByteString.Char8, bytestring Data.ByteString.Lazy.Char8

O(n) filter, applied to a predicate and a ByteString, returns a ByteString containing those characters that satisfy the predicate.

filter :: (Char -> Bool) -> Text -> Text

text Data.Text, text Data.Text.Lazy

O(n) filter, applied to a predicate and a Text, returns a Text containing those characters that satisfy the predicate.

filter :: (Word8 -> Bool) -> ByteString -> ByteString

bytestring Data.ByteString.Lazy

O(n) filter, applied to a predicate and a ByteString, returns a ByteString containing those characters that satisfy the predicate.

filter :: (Word8 -> Bool) -> ByteString -> ByteString

bytestring Data.ByteString

O(n) filter, applied to a predicate and a ByteString, returns a ByteString containing those characters that satisfy the predicate. This function is subject to array fusion.

mfilter :: MonadPlus m => (a -> Bool) -> m a -> m a

base Control.Monad

Direct MonadPlus equivalent of filter filter = (mfilter:: (a -> Bool) -> [a] -> [a] applicable to any MonadPlus, for example mfilter odd (Just 1) == Just 1 mfilter odd (Just 2) == Nothing

package bloomfilter

package

Pure and impure Bloom Filter implementations. Version 1.2.6.8

convolutionFilter1D :: PixelInternalFormat -> GLsizei -> PixelData a -> IO ()

OpenGL Graphics.Rendering.OpenGL.GL.PixelRectangles.Convolution

convolutionFilter2D :: PixelInternalFormat -> Size -> PixelData a -> IO ()

OpenGL Graphics.Rendering.OpenGL.GL.PixelRectangles.Convolution

convolutionFilterBias :: ConvolutionTarget -> StateVar (Color4 GLfloat)

OpenGL Graphics.Rendering.OpenGL.GL.PixelRectangles.Convolution

convolutionFilterScale :: ConvolutionTarget -> StateVar (Color4 GLfloat)

OpenGL Graphics.Rendering.OpenGL.GL.PixelRectangles.Convolution

copyConvolutionFilter1D :: PixelInternalFormat -> Position -> GLsizei -> IO ()