• Pascal

n := length(x);

• Ada

N : Count_Type := X.Length;

• C

size_t n = sizeof(x)/sizeof(*x);

• C

int n;
int x[5];
n = sizeof(x)/sizeof(*x);

• Clojure

(def n (count x))

• C++

size_t n = x.size();

• C#

int n = x.Count;

• C#

int n = x.Length;

• D

auto n = x.length;

• D

n = walkLength(x);

• Dart

int n = x.length;

• Elixir

n = Enum.count(x)

• Erlang

N = length(X).

• Fortran

n = size(x)

• Go

n := len(x)

• Groovy

def n = x.size()

• Haskell

let n = length x

• JS

var n = x.length;

• Java

int n = x.length;

• Java

int n = x.size();

• Kotlin

val n = x.size

• Lisp

(setf n (length x))

• Lua

local n = #x

• Obj-C

NSUInteger n=x.count;

• PHP

$n = count($x);

• Perl

$n = scalar @x;

• Perl

my $N = @x;

• Prolog

length(x, N).

• Python

n = len(x)

• Ruby

n = x.length

• Rust

let n = x.len();

• Scala

val n = x.size

• Scheme

(define n (length x))

• Smalltalk

n := x size.

• VB

Dim n As Integer = x.Count

• VB

n = UBound(x) + 1