find

The find function takes a predicate and a structure and returns the leftmost element of the structure matching the predicate, or Nothing if there is no such element.

Examples

Basic usage:

>>> find (> 42) [0, 5..]
Just 45

>>> find (> 12) [1..7]
Nothing

O(n) The find function takes a predicate and a ByteString, and returns the first element in matching the predicate, or Nothing if there is no such element.

find f p = case findIndex f p of Just n -> Just (p ! n) ; _ -> Nothing

O(n) The find function takes a predicate and a ByteString, and returns the first element in matching the predicate, or Nothing if there is no such element.

O(n) The find function takes a predicate and a ShortByteString, and returns the first element in matching the predicate, or Nothing if there is no such element.

find f p = case findIndex f p of Just n -> Just (p ! n) ; _ -> Nothing

O(n) The find function takes a predicate and a Text, and returns the first element matching the predicate, or Nothing if there is no such element.

O(n) The find function takes a predicate and a Text, and returns the first element in matching the predicate, or Nothing if there is no such element.

Find the first matching value. Subject to fusion

Return the canonical element of an equivalence class Point.

Find the first element of a Producer that satisfies the predicate

(find predicate) returns the first element that satisfies the predicate or Nothing if no element satisfies the predicate

(find predicate) returns the first byte that satisfies the predicate or Nothing if no byte satisfies the predicate

(find predicate) returns the first character that satisfies the predicate or Nothing if no character satisfies the predicate

Find index of elements which satisfy a predicate

>>> find (>0) (ident 3 :: Matrix Double)
[(0,0),(1,1),(2,2)]

The find function takes a predicate and a structure and returns the leftmost element of the structure matching the predicate, or Nothing if there is no such element.

O(n) Yield Just the first element matching the predicate or Nothing if no such element exists.

O(n) Yield Just the first element matching the predicate or Nothing if no such element exists.

O(n) Yield Just the first element matching the predicate or Nothing if no such element exists.

O(n) Yield Just the first element matching the predicate or Nothing if no such element exists.

find takes a predicate and a sequence and returns the first element in the sequence matching the predicate, or Nothing if there isn't an element that matches the predicate.

> find (== 5) [1 .. 10]
Just 5

> find (== 15) [1 .. 10]
Nothing

Search a directory recursively, with recursion controlled by a RecursionPredicate. Lazily return a sorted list of all files matching the given FilterPredicate. Any errors that occur are ignored, with warnings printed to stderr.

Return the left-most codepoint in ShortText that satisfies the given predicate.

>>> find (> 'b') "abcdabcd"
Just 'c'

>>> find (> 'b') "ababab"
Nothing

Find the first element in the stream that matches the predicate

Search a directory recursively for all files matching the given Pattern

List directory recursively (like the POSIX utility "find"). listing is relative if the path given is relative. If you want to filter out some results or fold over them you can do that with the returned files. A more efficient approach is to use one of the other find functions.

see find