length -package:vector -package:conduit -package:containers -package:text -package:rio
Returns the size/length of a finite structure as an
Int. The
default implementation just counts elements starting with the
leftmost. Instances for structures that can compute the element count
faster than via element-by-element counting, should provide a
specialised implementation.
Examples
Basic usage:
>>> length []
0
>>> length ['a', 'b', 'c']
3
>>> length [1..]
* Hangs forever *
length returns the length of a finite list as an
Int. It is an instance of the more general
genericLength, the result type of which may be any kind of
number.
>>> length []
0
>>> length ['a', 'b', 'c']
3
>>> length [1..]
* Hangs forever *
O(1) length returns the length of a ByteString as an
Int.
O(c) length returns the length of a ByteString as an
Int64
Counts the number of characters encoded in the bytestring. Note that
this includes replacement characters.
Counts the number of characters encoded in the bytestring. Note that
this includes replacement characters.
Counts the number of characters encoded in the bytestring. Note that
this includes replacement characters. The function is linear in the
number of bytes in the representation.
Return the length in bytes of a bytearray
Count the number of elements in a
Producer
Return the length of the container
Return the length of the byte stream in bytes
Return the length of the text stream in characters
Run a stream, keeping its length and its return value.
>>> S.print $ mapped S.length $ chunksOf 3 $ S.each [1..10]
3
3
3
1
Returns the size/length of a finite structure as an
Int. The
default implementation is optimized for structures that are similar to
cons-lists, because there is no general way to do better.
Count the number of bytes
Count the number of Unicode code-points in a
ShortText.
>>> length "abcd€"
5
>>> length ""
0
length t >= 0
O(n/c) length returns the length of a byte stream as an
Int together with the return value. This makes various maps
possible.
>>> Q.length "one\ntwo\three\nfour\nfive\n"
23 :> ()
>>> S.print $ S.take 3 $ mapped Q.length $ Q.lines "one\ntwo\three\nfour\nfive\n"
3
8
4
Some common quantity classes.