[Haskell-cafe] about Haskell code written to be "too smart"
manlio_perillo at libero.it
Tue Mar 24 14:42:24 EDT 2009
Tim Newsham ha scritto:
>> These friends are very interested in Haskell, but it seems that the
>> main reason why they don't start to seriously learning it, is that
>> when they start reading some code, they feel the "Perl syndrome".
>> That is, code written to be "too smart", and that end up being totally
>> illegible by Haskell novice.
>> I too have this feeling, from time to time.
>> Since someone is starting to write the Haskell coding style, I really
>> suggest him to take this "problem" into strong consideration.
> When you think about it, what you are saying is that Haskell programmers
> shouldn't take advantage of the extra tools that Haskell provides.
No, I'm not saying this.
But, as an example, when you read a function like:
buildPartitions xs ns = zipWith take ns . init $ scanl (flip drop) xs ns
that can be rewritten (argument reversed) as:
takeList :: [Int] -> [a] -> [[a]]
takeList  _ = 
takeList _  = 
takeList (n : ns) xs = head : takeList ns tail
where (head, tail) = splitAt n xs
I think that there is a problem.
The buildPartition contains too many "blocks".
And I have read code with even more "blocks" in one line.
It may not be a problem for a "seasoned" Haskell programmer, but when
you write some code, you should never forget that your code will be read
by programmers that can not be at your same level.
I think that many Haskell programmers forget this detail, and IMHO this
> Haskell provides the ability to abstract code beyond what many other
> programming systems allow. This abstraction gives you the ability to
> express things much more tersely. This makes the code a lot harder to
> read for people who are not familiar with the abstractions being used.
The problem is that I have still problems at reading and understanding
code that is too much terse...
Because I have to assemble in my mind each block, and if there are too
many blocks I have problems.
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