Re: [Haskell-cafe] pleac, examples, etc
On 14/11/06, chris moline <[EMAIL PROTECTED]> wrote: --- brad clawsie <[EMAIL PROTECTED]> wrote: > it would be great if some of the more informed > posters here took a stab > at filling in > > http://pleac.sourceforge.net/pleac_haskell/index.html > > a neat site for cookbook-style problem solving What I've always found funny about pleac is that none of the examples are actually Haskell, but some weird Haskell-with-oo-features. Does anyone know what language it is? Here are some examples: password = [1..8].mapM (\_ -> rand (0, chars.length -1) >>> (chars!)) -- in haskell, regexp are first class, then can be appended, sometimes easier to read m0' s = (s ==~ dec_number) They are actually Haskell, but notice the appendix: http://pleac.sourceforge.net/pleac_haskell/a1102.html It's Haskell with a completely bizarre prelude. No real new features were added to the language itself. Replacing composition with reverse function application is a waste of operator symbols. Personally, if I was going to change (.), it would be to define it as fmap, which (as a number of people, myself included, have pointed out) together with the instance of Functor for ((->) e) would generalise ordinary composition, map, liftM, etc. - Cale ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] pleac, examples, etc
--- brad clawsie <[EMAIL PROTECTED]> wrote: > it would be great if some of the more informed > posters here took a stab > at filling in > > http://pleac.sourceforge.net/pleac_haskell/index.html > > a neat site for cookbook-style problem solving What I've always found funny about pleac is that none of the examples are actually Haskell, but some weird Haskell-with-oo-features. Does anyone know what language it is? Here are some examples: password = [1..8].mapM (\_ -> rand (0, chars.length -1) >>> (chars!)) -- in haskell, regexp are first class, then can be appended, sometimes easier to read m0' s = (s ==~ dec_number) __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] pleac, examples, etc
Spencer Janssen <[EMAIL PROTECTED]> writes: > Please do not use the PLEAC Haskell cookbook for learning Haskell. The > author redefined many of the standard operators to produce code that isn't > standard Haskell. > > Here are some choice snippets from the first chapter: > > Now, we all know that the (.) operator is function composition, right? Not > in this example! The author has silently defined "(.) = flip ($)" -- a sort > of reverse function application. >> cut2fmt xs = xs.foldl aux (1,[]).snd.(GrabAll:).reverse > > Ah yes, (^) is surely exponent here? Nope, it's some kind of unholy > combination of show and (++). >> s9 = "I have "^10+1^" guanacos." > > More of the same: >> piece = s!![-8 .. -5] > > > Complaining aside, I do agree with you: we need more example-style > documentation. Rewriting the PLEAC cookbook might be a good start. i agree. A friend of mine did this haskell PLEAC version, and i would really like to have a /standard/ haskell one. (alas i've no more time to do it myself...) ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] pleac, examples, etc
Please do not use the PLEAC Haskell cookbook for learning Haskell. The author redefined many of the standard operators to produce code that isn't standard Haskell. Here are some choice snippets from the first chapter: Now, we all know that the (.) operator is function composition, right? Not in this example! The author has silently defined "(.) = flip ($)" -- a sort of reverse function application. > cut2fmt xs = xs.foldl aux (1,[]).snd.(GrabAll:).reverse Ah yes, (^) is surely exponent here? Nope, it's some kind of unholy combination of show and (++). > s9 = "I have "^10+1^" guanacos." More of the same: > piece = s!![-8 .. -5] Complaining aside, I do agree with you: we need more example-style documentation. Rewriting the PLEAC cookbook might be a good start. Cheers, Spencer Janssen On Nov 13, 2006, at 11:57 PM, brad clawsie wrote: it would be great if some of the more informed posters here took a stab at filling in http://pleac.sourceforge.net/pleac_haskell/index.html a neat site for cookbook-style problem solving from looking over haskell documentation for a few months now, i would say what is missing is one central cookbook-style document (want to query a database? want to parse xml? etc etc) thanks ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] pleac, examples, etc
it would be great if some of the more informed posters here took a stab at filling in http://pleac.sourceforge.net/pleac_haskell/index.html a neat site for cookbook-style problem solving from looking over haskell documentation for a few months now, i would say what is missing is one central cookbook-style document (want to query a database? want to parse xml? etc etc) thanks ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
