What I think about Lua after shipping a project with 60k lines of code

Original Article ↗ Hacker News Discussion ↗

Lua in game development & scripting

  • Many commenters use Lua for game logic (including large projects, Love2D games, fantasy consoles, engines, mods), trading systems, ad targeting, Redis scripts, Wireshark dissectors, neovim and other app scripting.
  • Praised as extremely simple, small, and easy to embed; ideal as a DSL for domain experts and moddability.
  • Some see it as “perfect for application scripting” but not their first choice for full core engines or very large, long‑lived systems.

Scripting vs compiled languages in games

  • Linked video criticizing scripting languages in gamedev sparked debate.
  • Arguments against scripting for core game logic: performance, error‑proneness with less experienced scripters, complex engine integration.
  • Counterpoints: scripting is great for mods, E2E tests, iterative gameplay tweaks, and separating core engine (C/C++/Rust) from high‑level behavior.
  • Several claim modern hot‑reload and fast compilers in compiled languages partially replace scripting’s iteration advantages.

Tables, typing, and language design

  • “Everything is a table” is both admired and disliked:
    • Pro: powerful, uniform data model, good for ASTs/DSLs, simple mental model.
    • Con: no clear separation between arrays and maps; # and “sequence” rules are non‑obvious; holes and nils are footguns.
  • One‑based indexing and nil‑on-missing are frequent pain points; silent nil on typos leads to late runtime failures.
  • Dynamic typing seen as liberating for prototypes but fragile for large codebases.
  • Typed variants (Teal, Luau) and comment‑based annotations plus LSPs are discussed; some prefer gradual typing, others dislike transpile steps.

Performance, GC, and tooling

  • Performance is “adequate” for scripting, but some in engines hit GC pauses and need careful tuning or native fallbacks.
  • LuaJIT is cited as very fast but version‑locked.
  • Tooling has improved (language servers, linters, IDE support), but some still find it weaker than mainstream languages.

Ecosystem, packaging, and alternatives

  • Embeddability and trivial C build are major advantages over Python and others, especially on unusual platforms or kernels.
  • LuaRocks works for some but is seen as messy or ignored by many; dependency management on Windows can be painful.
  • Alternatives mentioned: Rust, C#, Go, Scheme‑like/Fennel on top of Lua, other new systems languages, but Lua remains valued for its niche of small, embeddable scripting.