Randomness in Cairo

Basic hash based approach

Easiest way to get a random number is to start with some input (maybe a counter?) and hash it. And there you go, you have several bits of randomness right there. This is what I've had in my projects like dojo-shooter to, say, pick the coordinates where a zombie spawns. This works fine for trivial games but I can easily predict exactly where the zombies will spawn well before the game starts. You can use randomness from other contracts as salt. But idea is pretty much the same.

Implementation in ./src/hash.cairo