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Idiom #169 String length

Assign to integer n the number of characters of string s.
Make sure that multibyte characters are properly handled.
n can be different from the number of bytes of s.

my $n = length( $s );
n : Integer := s'Length;
(def n (.codePointCount s 0 (count s)))
IDENTIFICATION DIVISION.
PROGRAM-ID. length.
PROCEDURE DIVISION.
   MOVE FUNCTION LENGTH(s) TO n
STOP RUN.
auto utf8len(std::string_view const& s) -> size_t
{
	std::setlocale(LC_ALL, "en_US.utf8");

	auto n = size_t{};
	auto size = size_t{};
	auto mb = std::mbstate_t{};

	while(size < s.length())
	{
		size += mbrlen(s.data() + size, s.length() - size, &mb);
		n += 1;
	}

	return n;
}
int n = s.Length;
std.range;
size_t n = s.walkLength;
import std.uni, std.range;
size_t n = s.byGrapheme.walkLength;
size_t n = s.length;
int n = s.length;
n = String.length s
N = string:length(S)
n = len(s)
import "unicode/utf8"
n := utf8.RuneCountInString(s)
n = length s
const n = s.length;
int n = s.length();
val n = s.length
(setf n (length s))
(length s)
local n = utf8.len(s)
@import Foundation;
NSUInteger n=s.length;
$n = mb_strlen($s, 'UTF-8');
uses sysutils;
n := s.length;
uses LazUtf8;
n := length(s);
uses LazUtf8;
n := Utf8Length(s);
n = len(s)
n = s.size
n = s.length
let n = s.chars().count();
val n = s.length()
Dim n As Integer = s.Length
New implementation...
programming-idioms.org 
my $n = length( $s );
n : Integer := s'Length;
(def n (.codePointCount s 0 (count s)))
IDENTIFICATION DIVISION.
PROGRAM-ID. length.
PROCEDURE DIVISION.
   MOVE FUNCTION LENGTH(s) TO n
STOP RUN.
auto utf8len(std::string_view const& s) -> size_t
{
	std::setlocale(LC_ALL, "en_US.utf8");

	auto n = size_t{};
	auto size = size_t{};
	auto mb = std::mbstate_t{};

	while(size < s.length())
	{
		size += mbrlen(s.data() + size, s.length() - size, &mb);
		n += 1;
	}

	return n;
}
int n = s.Length;
size_t n = s.walkLength;
size_t n = s.byGrapheme.walkLength;
size_t n = s.length;
int n = s.length;
n = String.length s
N = string:length(S)
n = len(s)
n := utf8.RuneCountInString(s)
n = length s
const n = s.length;
int n = s.length();
val n = s.length
(setf n (length s))
(length s)
local n = utf8.len(s)
NSUInteger n=s.length;
$n = mb_strlen($s, 'UTF-8');
n := s.length;
n := length(s);
n := Utf8Length(s);
n = len(s)
n = s.size
n = s.length
let n = s.chars().count();
val n = s.length()
Dim n As Integer = s.Length