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Languages & runtimes · #haxe
Haxe's #if directives strip code before type checking, making them ideal for dependency management but risky for divergent logic. Learn where conditional compilation fits and when to use target-specific classes instead.
Learn how to use Haxe’s #if directives and -D flags to keep one codebase that compiles cleanly for JS, HXCPP, and other targets. Follow a step‑by‑step guide to set up flags, write platform‑specific blocks, verify builds, and avoid common pitfalls.
Haxe compiles one codebase to many targets, but platform APIs differ. Learn when to use #if conditionals, custom -D flags, or separate modules—and how to verify each build.
Learn how to structure a Haxe library so a pure‑Haxe core runs unchanged on JavaScript, Python, and the JVM, with thin extern adapters behind conditional compilation and a single facade.
Learn how Haxe abstract types give you strong typing for primitives like metres or seconds without any runtime overhead, with a worked example and verification steps.
Haxe macros generate typed code at compile time, eliminating boilerplate with zero runtime cost. This guide walks through a working build-info macro, hygiene rules, compile-time costs, and how to verify expansions in the generated target output.
Use Haxe’s #if directives to prune platform‑specific code, eliminating dead code and runtime checks. A concrete logger example shows how to compile clean outputs for JS, C++, and other targets.
Use Haxe conditional compilation as a compile-time seam for platform differences, not as general branching. Isolate JS and C++ APIs behind small abstractions, keep flags in one place, and verify generated output is stripped per target.
Haxe macros run at compile time and rewrite your AST before target code is generated. Here's a worked compile-time validation example, plus the debugging, versioning, and cross-target trade-offs that decide whether a macro belongs in your codebase.