[Haskell-cafe] The question of ByteString

Paul Johnson paul at cogito.org.uk
Sat Nov 3 07:42:15 EDT 2007

Andrew Coppin wrote:
> Duncan Coutts wrote:
>> Yes, the semantics are different. ByteString is stricter. In some
>> circumstances you could discover that some list is being used
>> sufficiently strictly (spine and element strict) that you could do a
>> representation change to use strict arrays. It is something I have
>> pondered occasionally and I think that is an interesting avenue for
>> research.
Also important is the fact that String = [Char], and a Char can hold any 
Unicode character, whereas a ByteString is a sequence of Word8 elements 
(i.e. integers from 0-255).  If you want to store a Char in a ByteString 
then you have to convert it to UTF-8 or something similar.

The Encoding package 
has the functions for this kind of thing.


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