filter -is:exact -package:base -package:unordered-containers
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 ByteString,
returns a ByteString containing those characters that satisfy the
predicate.
O(n). Filter all values that satisfy some predicate.
filter (> "a") (fromList [(5,"a"), (3,"b")]) == singleton 3 "b"
filter (> "x") (fromList [(5,"a"), (3,"b")]) == empty
filter (< "a") (fromList [(5,"a"), (3,"b")]) == empty
O(n). Filter all elements that satisfy some predicate.
O(n). Filter all values that satisfy the predicate.
filter (> "a") (fromList [(5,"a"), (3,"b")]) == singleton 3 "b"
filter (> "x") (fromList [(5,"a"), (3,"b")]) == empty
filter (< "a") (fromList [(5,"a"), (3,"b")]) == empty
The
filter function takes a predicate
p
and a sequence
xs and returns a sequence of those elements
which satisfy the predicate.
O(n). Filter all elements 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.
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]
Generates a value that satisfies a predicate.
This is essentially:
filter p gen = mfilter p gen <|> filter p gen
It differs from the above in that we keep some state to avoid looping
forever. If we trigger these limits then the whole generator is
discarded.
Returns a tree containing only elements that match the predicate.
If the root of the tree does not match the predicate then
Nothing is returned.
(filter predicate) only forwards values that satisfy the
predicate.
filter (pure True) = cat
filter (liftA2 (&&) p1 p2) = filter p1 >-> filter p2
filter f = mapMaybe (\a -> a <$ guard (f a))
filter p xs removes any elements from
xs that
do not satisfy
p.