• Java

int n = mymap.size();

• Clojure

(def n (count mymap))

• C++

auto n = mymap.size();

• C#

n = mymap.Count;

• D

const n = mymap.length;

• Dart

var n = mymap.length;

• Go

n := len(mymap)

• Groovy

def n = mymap.size()

• Haskell

getMapSize :: Map.Map k v -> Int
getMapSize m = Map.size m

• JS

const n = mymap.size

• Lua

local n=0
for _ in pairs(mymap) do n=n+1 end

• PHP

$n = count($mymap);

• Pascal

n := MyMap.Count;

• Perl

my $n = keys %mymap;

• Python

n = len(mymap)

• Ruby

n = mymap.size

• Rust

let n = mymap.len();

• Scala

val n = mymap.size

• Smalltalk

n := mymap size.