Hello World in many programming languages:)

hello-world.js

console.log('Hello World!');

HelloWorld.cs

namespace HelloWorld;

internal class HelloWorld {
    static void Main(string[] args) {
        Console.WriteLine("Hello World!");
    }
}

HelloWorld.java

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello World!");
    }
}