Fwd: [Haskell-cafe] Bytestrings and [Char]
Alberto G. Corona
agocorona at gmail.com
Tue Mar 23 16:56:34 EDT 2010
The question can be generalized via type classes: Is there any common set of
primitives encapsulated into a single type class that has instances for
Strings (Data.List) ByteStrings, Data.Text, Lazy bytestrings, Arrays,
vectors and wathever container that can store an boxed, unboxed, packed
unpacked sequence of wathever including chars? All of them have folds,
heads, tails and a lot of common functions with the same name, but since
there is not a single type class, the library programmer can not abstract
his code when it is possible, so the library user can chose the particular
instance for his particular problem.
2010/3/23 Johann Höchtl <johann.hoechtl at gmail.com>
On 22.03.2010 14:15, Ivan Miljenovic wrote:
>> On 23 March 2010 00:10, Johan Tibell<johan.tibell at gmail.com> wrote:
>>> A sequence of bytes is not the same thing as a sequence of Unicode
>>> code points. If you want to replace String by something more efficient
>>> have a look at Data.Text.
>> Though Data.Text still has the disadvantage of not being as nice to
>> deal with as String, since you can't pattern match on it, etc.
>> Whilst it may degrade performance, treating String as a list of
>> characters rather than an array provides you with greater flexibility
>> of how to deal with it.
> But doesn't this basically mean sacrifice performance / applicability for
> algorithmic beauty? Sure, pattern match comes in handy, but in the case of
> strings at a high price
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