Haxe Online Compiler

Haxe is a language that compiles to other languages. Write your code once in Haxe, and the compiler can output JavaScript, C++, Java, C#, Python, Lua, or PHP. This makes it popular in game development (the Heaps engine and the framework behind Dead Cells use it) and in situations where you need the same logic running on multiple platforms.

The language itself feels like a typed version of ActionScript or a cleaner Java. It has type inference, pattern matching, macros, and a solid standard library. The cross-compilation part is the real selling point though.

When to use a Haxe online compiler

Setting up Haxe locally means installing the compiler, choosing a target, and configuring the build. For a quick test -- checking syntax, trying a class design, or verifying how a particular Haxe feature works -- that setup adds friction. An online compiler lets you skip straight to writing code.

A class with generics and pattern matching

class Main {
    static function findMax<T:Float>(arr:Array<T>):T {
        var max = arr[0];
        for (val in arr) {
            if (val > max) max = val;
        }
        return max;
    }

    static function describe(value:Dynamic):String {
        return switch(Type.typeof(value)) {
            case TInt: 'Integer: $value';
            case TFloat: 'Float: $value';
            case TClass(String): 'String: "$value"';
            default: 'Other type';
        }
    }

    static function main() {
        var scores = [72, 95, 88, 41, 63];
        trace('Scores: $scores');
        trace('Highest: ${findMax(scores)}');

        trace(describe(42));
        trace(describe("hello"));
        trace(describe(3.14));
    }
}

This shows a few things that make Haxe interesting: generic type parameters with constraints (T:Float), string interpolation, switch used as an expression, and runtime type inspection. The syntax is familiar enough that most developers can read it without a tutorial.

Haxe on OneCompiler

OneCompiler compiles and runs Haxe code directly in the browser. You get immediate output from trace() calls. It's a good fit for exploring Haxe's type system, testing class hierarchies, and getting comfortable with the language before committing to a full project setup.

Write Haxe here: Haxe Online Compiler on OneCompiler