New implementation

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

Other implementations
with Ada.Text_IO;
use Ada.Text_IO;
Put_Line ("Hello World!");
#include <stdio.h>
printf("Hello World\n");
print_endline "Hello World!"
(println "Hello World")
DISPLAY "Hello World!".
#include <iostream>
std::cout << "Hello World" << std::endl;
System.Console.WriteLine("Hello World!");
pragma(msg, "Hello World");
import std.stdio;
writeln("Hello world!");
print("Hello World");
"Hello World" |> IO.puts
IO.puts "Hello World"
io:format("~s~n", ["Hello, world!"])
print *, 'Hello, world!'
import "fmt" 
fmt.Println("Hello World")
putStrLn "Hello world!"
console.log('Hello World');
document.write("Hello World!");
System.out.println("Hello World");
println("Hello world!")
(print "Hello World")
(princ "Hello, world!")
(format T "Hello World")
print("Hello World")
#import <stdio.h>
NSLog(@"Hello world\n");
echo "Hello World" . PHP_EOL;
<?='Hello World'?>
<?php echo 'Hello World'; ?>
WriteLn('Hello, world!');
print "Hello, world!";
use 5.010;
say 'Hello World';
format("Hello world~n")
write('Hello, world!\n')
print("Hello World")
puts "Hello World"
println!("Hello World");
println("Hello, World!")
(display "Hello World")
System.Console.WriteLine("Hello World!")