[Haskell-cafe] Re: Functional programming for processing
simonpj at microsoft.com
Thu Jun 22 04:22:34 EDT 2006
| Everything else about Haskell is so great and well thought out (eg
| classes, no side effects, higher rank polymorphism, existentials) it
| pity to throw all this away just because of one unfortunate feature
I thought it might be worth mentioning that GHC (well, the HEAD, which
will become 6.6) supports "bang patterns". See
Bang patterns make it much more convenient to write a strict function.
f (x, !y) = ...
is strict both in the pair (of course) but also in the second component
of the pair, y.
You can also use them in lets
let !x = <rhs> in <body>
which will evaluate <rhs> before <body>.
It's an experimental feature, and I'm interested to know how useful, or
otherwise, it turns out to be.
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