filter -package:base -package:ghc -is:exact is:exact -package:containers -package:pipes -package:hedgehog
O(n) filter, applied to a predicate and a ByteString,
returns a ByteString containing those characters that satisfy the
predicate.
O(n) filter, applied to a predicate and a ByteString,
returns a ByteString containing those characters that satisfy the
predicate.
O(n) filter, applied to a predicate and a
ShortByteString, returns a ShortByteString containing those characters
that satisfy the predicate.
O(n) filter, applied to a predicate and a
Text,
returns a
Text containing those characters that satisfy the
predicate.
O(n) filter, applied to a predicate and a stream,
returns a stream containing those characters that satisfy the
predicate.
Properties
unstream . filter p . stream = filter p
Filter all keys/values that satisfy some predicate.
O(n) Drop all elements that do not satisfy the predicate.
Drop elements which do not satisfy the predicate
Drop elements which do not satisfy the predicate
O(n) Drop all elements that do not satisfy the predicate.
O(n) Drop all elements that do not satisfy the predicate.
O(n) Drop all elements that do not satisfy the predicate.
O(n) Drop all elements that do not satisfy the predicate.
Filter this map by retaining only elements which values
satisfy a predicate.
Filter this set by retaining only elements satisfying a
predicate.
Keep only values in the stream passing a given predicate.
Subject to fusion
Keep only values in the stream passing a given predicate.
Subject to fusion
Since 0.3.0
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]
>>> filter odd [1, 2, 3]
[1,3]
filter p xs removes any elements from
xs that
do not satisfy
p.
Drops chunks from an input stream if they fail to match a given filter
predicate. See
filter.
Items pushed back to the returned stream are propagated back upstream.
Example:
ghci> Streams.fromList ["the", "quick", "brown", "fox"] >>=
Streams.filter (/= "brown") >>= Streams.toList
["the","quick","fox"]
Skip elements of a stream that fail a predicate