Implementation
Ruby

Be concise.

Be useful.

All contributions dictatorially edited by webmasters to match personal tastes.

Please do not paste any copyright violating resource.

Please try to avoid dependencies to third-party libraries and frameworks.

Other implementations
System.out.println("Hello World");
print "Hello World"
echo "Hello World\n";
import "fmt" 
fmt.Println("Hello World")
document.write("Hello World!");
#include <stdio.h>
printf("Hello World\n");
System.Console.WriteLine("Hello World!");
#include <iostream>
std::cout << "Hello World\n";
println!("Hello World");
with Ada.Text_IO;
use Ada.Text_IO;
Put("Hello World!");
print_endline "Hello World!"
(println "Hello World")
import std.stdio;
writeln("Hello world!");
print("Hello World");
io:format("~s~n", ["Hello, world!"])
write(*,*) 'Hello, world!'
(princ "Hello, world!")
WriteLn('Hello, world!');
print "Hello, world!";
println("Hello, World!")
(display "Hello World")
#import <stdio.h>
NSLog(@"Hello world\n");
System.Console.WriteLine("Hello World!")
write('Hello, world!\n')
print("Hello World")
putStrLn "Hello world!"
IO.puts "Hello World"
print("Hello World")
pragma(msg, "Hello World");
console.log("Hello World");
format("Hello world~n")
"Hello World" |> IO.puts
IDENTIFICATION DIVISION.
PROGRAM-ID. hello.
PROCEDURE DIVISION.
DISPLAY "Hello World!".
STOP RUN.