I did use that a couple of times (`xor`ing 2 ByteStrings together), and was
surprised by the omission back then, but IIRC (can't validate now), there's
a specialised zipWith (as proposed) in the module (with some other name,
obviously), which is not exported, but used when you 'pack' the result of
'zipWith' when the result is '[Word8]'... You might want to look into that.
Nicolas
On Sep 12, 2013 8:11 PM, "John Lato"
Carter: we don't have both. We have one function from each category. My guess is nobody's ever really needed a really fast zipWith :: (Word8->Word8->Word8) -> ByteString -> ByteString -> ByteString; that's the only reason I can think of for its omission.
On Thu, Sep 12, 2013 at 10:45 AM, Carter Schonwald < carter.schonwald@gmail.com> wrote:
Scott: benchmark the two and you'll see why we have both :-)
On Thursday, September 12, 2013, Scott Lawrence wrote:
On Thu, 12 Sep 2013, Tom Ellis wrote:
On Thu, Sep 12, 2013 at 09:21:20AM -0400, Scott Lawrence wrote:
Something's always bothered me about map and zipWith for ByteString. Why is it
map :: (Word8 -> Word8) -> ByteString -> ByteString
but
zipWith :: (Word8 -> Word8 -> a) -> ByteString -> ByteString -> [a]
Well, what if you wanted to zipWith a function of type "Word8 -> Word8 -> Foo" instead of "Word8 -> Word8 -> Word8"?
Then I would do what I do with map, and call `unpack` first.
Either of the two options is usable:
map :: (Word8 -> Word8) -> ByteString -> ByteString zipWith :: (Word8 -> Word8 -> Word8) -> ByteString -> ByteString -> ByteString (or) map :: (Word8 -> a) -> ByteString -> [a] zipWith :: (Word8 -> Word8 -> a) -> ByteString -> ByteString -> [a]
I just don't understand why we have one from each.
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