Working examples
🧬 Game of Life — Rust + WASM
Conway’s Game of Life on a 200×150 grid (30,000 cells) running at 60fps. Color-coded by neighbor density. Seeded with a Gosper glider gun and R-pentomino for emergent complexity.
The Rules
Each cell follows four simple rules:
Underpopulation — A live cell with fewer than 2 neighbors dies
Survival — A live cell with 2 or 3 neighbors lives
Overpopulation — A live cell with more than 3 neighbors dies
Reproduction — A dead cell with exactly 3 neighbors becomes alive
Why WASM?
The inner loop iterates 30,000 cells, each checking 8 neighbors = 240,000 reads per generation. At 60 generations per second, that’s 14.4 million cell reads per second. Rust’s tight memory layout (a flat Vec<bool>) and LLVM optimization make this smooth even on mobile.
Visual Design
Cells are colored by neighbor count to reveal density patterns:
■ Cyan — 0–1 neighbors (isolated/dying)
■ Green — 2 neighbors (stable)
■ Orange — 3 neighbors (reproductive)
■ Red — 4+ neighbors (overcrowded)
Interaction
Click or tap any cell to toggle it alive/dead. Draw patterns and watch them evolve. The Gosper glider gun at the top-left continuously emits gliders that traverse the toroidal grid.
Seeded Patterns
Gosper glider gun — The first known finite pattern that grows indefinitely
R-pentomino — A 5-cell pattern that takes 1,103 generations to stabilize
Random soup — 25% density random fill for chaotic emergence
Build
wasm-pack build rust/life --target web --out-dir ../../resources/public/wasm/life