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Since they return ZIO, you can't use them directly. In our case we often include the current time in the environment R (so we get it before running the ZPure and then the value is consistent during the execution since the environment is read-only). For random, we use Scala Random directly wrapped inside ZPure.suspend.

I apologize, I'm still a bit confused about the Random part.

I understand it's like defining something like: def nextInt: Program[Int] = ZPure.suspend(ZPure.attempt(rng.nextInt()))?

Does using Scala's Random directly lead to a loss of purity? Could you please explain it a bit more concretely? Thank you.

That's right, that's how we do if we need it. It's non-deterministic but I think it's acceptable since it doesn't cause any actual side effects.