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

On Wed, 30 Sep 2009, Jochem Berndsen wrote:

Bulat Ziganshin wrote:

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Hello Paul,

Wednesday, September 30, 2009, 1:18:03 PM, you wrote:

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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

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sum . zipWith (*) (iterate (2*) 1) , but it's probably not very important.

Or sum . zipWith (*) (iterate (flip shiftL 1) 1) . map fromEnum in order to make the bitset nature more explicit.