Comment by elbear

Ok, I had a better look at the code and I realised that it doesn't follow the rule I was talking about, namely having the function only work on values it receives as inputs.

I think that's why I don't use closures, because they read values from the environment. Their only use case (that comes to mind) can be solved with partial application, which is safer.

Oh, and I wasn't using laziness in the Haskell sense, but more in the general sense of deferring evaluation.