Create a hello world in Haxe

build.hxml

-cp src
-D analyzer-optimize
-main Main
--interp

# this build file assums that you have a folder structure like this:
#
# + src
#   - Main.hx
# build.hxml
#
# Run build.hxml with:
# `haxe build.hxml`

compile and run using Haxe compiler

haxe -main Main --interp

Main.hx

// 👋 Hello World in Haxe
/*
	Declaring an empty package. A package isn't necessary, but it's useful if you want to create
	a namespace for your code (e.g. org.yourapp.ClassName).

	Omitting package declaration is the same as declaring an empty package.
*/
package; // empty package, no namespace.

// Here's the class definition.
// It's the main class for the file, since it has the same name (Main).
class Main {

	// a constructor 
	function new() {
		/*
			Trace is the default method of printing haxe expressions to the screen.
			Different targets will have different methods of accomplishing this.  
			E.g., java, c++, c#, etc. will print to std out.
			Javascript will print to console.log. All traces come with a default newline.
			Finally, It's possible to prevent traces from showing by using the
			"--no-traces" argument on the compiler.
		*/
		trace("Hello, World! 🌍👋"); // Print a greeting
	}

	/*
		If you want certain code to run automatically, you need to put it in
		a static main function, and specify the class in the compiler arguments.
	*/
	static public function main() {
		var main = new Main();
	}
}