[Haskell-cafe] convert a list of booleans into Word*

[Eugene Kirpichov]

...Or let's fuse it.
sum . zipWith ((*).(2^)) [0..]

2009/9/30 Jochem Berndsen <jochem at functor.nl>:
> Bulat Ziganshin wrote:
>> Hello Paul,
>>
>> Wednesday, September 30, 2009, 1:18:03 PM, you wrote:
>>
>>> I haven't found a function in hackage or in the standard library that
>>> takes a list of booleans (or a list of 0s and 1s, or a tuple of booleans
>>> or 0s and 1s) and outputs a Word8 or Word32.
>>
>> sum . zipWith (*) (map (2^) [0..])
>
> I'd turn this into
>> sum . zipWith (*) (iterate (2*) 1)
> , but it's probably not very important.
>
> Regards, Jochem
> --
> Jochem Berndsen | jochem at functor.nl | jochem@牛在田里.com
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-- 
Eugene Kirpichov
Web IR developer, market.yandex.ru