[Haskell-cafe] On the purity of Haskell

[Никитин Лев]

If seed depends of psudo random event, for example of current systime,
we must use IO action.

30.12.2011, 02:47, "Steve Horne" <sh006d3592 at blueyonder.co.uk>:

>
> BTW - why use an IO action for random number generation? There's a
> perfectly good pure generator. It's probably handy to treat it
> monadically to sequence the generator state/seed/whatever but random
> number generation can be completely pure.
>
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