ludic/docs/language/structure/kw-var.md
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docs(api): per-symbol pages, fuzzy search, deep token linking, hover cards
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-29 17:53:22 +03:00

1.3 KiB


id: kw-var name: var category: structure kind: keyword tokens: var sig: var name: T = value tip: A mutable binding — at program scope, your game's persistent named state. order: 6

A var declares a mutable binding: unlike let, you may reassign it later with =, +=, -=, and friends. Where it appears decides its lifetime — inside a handler or function body it is a local, and at program scope it is persistent, named game state that every handler shares. Program-scope vars are the modern replacement for numeric registers: instead of reg(0), you write var score: int = 0 and read and write score by name. Use var for anything that genuinely changes — accumulators, the current score, a mode flag, an elapsed-frame counter — and prefer let for values that never change.

program Scorekeeper {
  var score: int = 0
  var elapsed_frames: int = 0

  handler Tick phase Update {
    elapsed_frames = elapsed_frames + 1
    if elapsed_frames % 60 == 0 { score = score + 1 }
  }

  handler DrawWorld phase Render {
    Screen.clear(Color.MidnightBlue)
    Screen.draw_text(x: 6, y: 4, text: "SCORE", color: Color.White, scale: 1)
    Screen.draw_number(x: 52, y: 4, value: score, color: Color.Gold, scale: 1)
    Screen.show()
  }
}