Programs you can watch run.

Each demo runs next to the file that defines it.

Conway's Game of Life. Complex systems grow from simple, verified parts.

Cells live or die each generation by counting live neighbours.

Running

Step 0

generation 0 — 7 alive — press Step to advance

Change the length or gravity; the same evaluator that runs your app recomputes it.

A bob swings from a pivot under tension and gravity.

Running

Step 0

ready — bob at -75.1° from vertical; press Step or Run to swing

Write your own.

Install the CLI and run a program in a minute.

The language where the rule is the program.

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