[Haskell-cafe] Why purely in haskell?

Neil Mitchell ndmitchell at gmail.com
Wed Jan 9 09:55:53 EST 2008

Hi Shen,

> I got question about why haskell insist to be a purely FL. I mean is
> there any feature which is only support by pure?

Laziness. It is very difficult to have a lazy language which is not pure.

Laziness and purity together help with equational reasoning, compiler
transformations, less obscure bugs, better compositionality etc.



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