• Pascal

var n,i: integer;
[...]
n:= length(x);
setlength(x, n+1);
for i := 0 to (n div 2)-1 do
	begin
		x[n] := x[i];
		x[i] := x[n-i-1];
		x[n-i-1] := x[n];
	end;
setlength(x, n);

• Pascal

var n,i: integer;
	tmp:TElement;
[...]
n:= length(x);
for i := 0 to (n div 2)-1 do
	begin
		tmp := x[i];
		x[i] := x[n-i-1];
		x[n-i-1] := tmp;
	end;

• Ada

X.Reverse_Elements;

• C

int *p1 = x;
int *p2 = x + N-1;

while (p1 < p2)
{
    int temp = *p1;
    *(p1++) = *p2;
    *(p2--) = temp;
}

• Caml

List.rev x

• Clojure

(reverse x)

• C++

std::reverse(begin(x), end(x));

• C#

x.Reverse();

• D

auto y = x.retro;

• D

reverse(x);

• Dart

x = x.reversed.toList();

• Elixir

x = Enum.reverse(x)

• Erlang

lists:reverse(List)

• Fortran

  a = a(ubound(a,dim=1)::-1)

• Go

slices.Reverse(x)

• Go

func reverse[T any](x []T) {
	for i, j := 0, len(x)-1; i < j; i, j = i+1, j-1 {
		x[i], x[j] = x[j], x[i]
	}
}

• Go

for i, j := 0, len(x)-1; i < j; i, j = i+1, j-1 {
	x[i], x[j] = x[j], x[i]
}

• Groovy

x = x.reverse()

• Haskell

reverse x

• JS

x = x.reverse();

• Java

int i, m = x.size(), n = m-- / 2;
for (i = 0; i < n; ++i) swap(x, i, m - i);

• Java

Collections.reverse(x);

• Java

static <T> void reverse(List<T> x){
	int n = x.size();
	for(int i=0;i<n/2;i++){
		T tmp = x.get(i);
		x.set(i, x.get(n-i-1));
		x.set(n-i-1, tmp);
	}
}

• Java

Collections.reverse(x);

• Java

reverse(x);

• Kotlin

val reversedView = x.asReversed()

• Kotlin

x.reverse()

• Kotlin

x = x.reversed()

• Lisp

(reverse x)

• Lua

function array_reverse(x)
  local n, m = #x, #x/2
  for i=1, m do
    x[i], x[n-i+1] = x[n-i+1], x[i]
  end
  return x
end

• Lua

rev = {}
for i=#x, 1, -1 do
	rev[#rev+1] = x[i]
end
x = rev

• Lua

rev = {}
for i=#x, 1, -1 do
	rev[#rev+1] = x[i]
end

-- in-situ reversal
function reverse(t)
  local n = #t
  local i = 1
  for i = 1, n do
    t[i],t[n] = t[n],t[i]

    n = n - 1
  end
end

• Obj-C

x.reverseObjectEnumerator.allObjects

• PHP

$x = array_reverse($x, true);

• Perl

my @list = ('words', 'of', 'list', 'a', 'reverse');
my @reversed = reverse @list;

• Prolog

reverse(x, Reversed).

• Python

x.reverse()

• Python

x = reversed(x)

• Python

y = x[::-1]

• Ruby

x.reverse!

• Rust

x.reverse();

• Rust

let y: Vec<_> = x.into_iter().rev().collect();

• Scala

x = x.reverse

• Scheme

(reverse x)

• Smalltalk

X reversed.

• VB

Dim ItemList As New List(Of String)(New String() {"one", "two", "three"})
ItemList.Reverse()
For Each item In ItemList
    Console.WriteLine(item)
Next