1.3 Hello World

The following program prints "Hello World" after being compiled and run:

/**
    Multi-line comments for documentation.
**/
class Main {
    static public function main():Void {
        // Single line comment
        trace("Hello World");
    }
}

This can be tested by saving the above code to a file named Main.hx and invoking the Haxe Compiler like so: haxe -main Main --interp. It generates the following output: Main.hx:3: Hello world. There are several things to learn from this:

Haxe programs are saved in files with an extension of .hx.
The Haxe Compiler is a command-line tool which can be invoked with parameters such as -main Main and --interp.
Haxe programs have classes (Main, upper-case), which have functions (main, lower-case).
The name of the file containing a Haxe class is the same as the name of the class itself (in this case Main.hx).