Gregg Reynolds <d...@mobileink.com> писал(а) в своём письме Fri, 30 Dec
2011 17:23:20 +0200:
Regarding side-effects, they can be (informally) defined pretty simply:
any non-computational effect caused by a computation is a side-effect.
I wonder: can writing to memory be called a “computational effect”? If
yes, then every computation is impure. If no, then what’s the difference
between memory and hard drive?
By the way, the Data.HashTable is in IO monad. Is it impure? Would it be
pure if designers had chosen to use ST instead?
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