Game of Life

Conway’s Game of Life: a zero-player cellular automaton where each cell lives, dies, or is born each tick based on its eight neighbors. Grid wraps at the edges (toroidal), so gliders and other spaceships loop forever instead of running off the board. Starts from a random soup; click any cell to toggle it by hand.

Reuse

src/life.js exports pure functions over a plain 2D array of 0/1 (grid[y][x]): createGrid(cols, rows), randomize(cols, rows, density), step(grid) returning the next generation, and stampGlider(grid, x, y) for seeding a known-good pattern. No dependencies, no rendering — bring your own renderer.

Gotchas

• step always allocates a fresh grid rather than mutating in place, so in-progress neighbor counts never read half-updated cells.
• The demo bundles its own copy of life.js (self-contained by contract); re-copy after editing src/.
• Controls: click/tap toggles a cell, space play/pauses, R reseeds a random soup, C clears the board, G stamps a glider near the top-left corner.