[Haskell-cafe] Haskell Cheat Sheet?

[Dan Weston]

It seems no one liked idea #2. I still think fix is the wrong name for 
this, maybe limit would be better.

Dan Weston wrote:
> One suggestion:
> 
> Section 3.6 defines a function "fix":
> 
>  fix :: Eq x => (x -> x) -> x -> x
> 
>  fix f x = if x == x' then x else fix f x'
>      where x' = f x
> 
> This confusingly differs in both type and meaning from the traditional 
> function Control.Monad.Fix.fix and is not even used elsewhere in the 
> document.
> 
> I suggest that it be removed and the real Control.Monad.Fix.fix function 
> be defined in its own section, with an side-by-side comparison with a 
> named recursive function. This would be useful because the type
> 
> fix :: (a -> a) -> a
> 
> is highly confusing, suggesting to newcomers a usage like:
> 
> f = fix (+1)
> 
> which is undefined (and seems to be "missing an argument"), when 
> invariably its type is in practice restricted to:
> 
> fix :: ((a -> b) -> (a -> b)) -> (a -> b)
> 
> which is much more suggestive (but nowhere to be found in the docs).
> 
> Dan Weston
> 
> Don Stewart wrote:
>> evan:
>>> Has anybody made (or have a link to) a Haskell reference cheat sheet?
>>> I'm thinking of a nice LaTeXed PDF in the 1-10 page range (e.g.
>>> something like this http://www.tug.org/texshowcase/cheat.pdf) with the
>>> basics of the language syntax, the type declarations for the common type
>>> classes, the type signatures of the most commonly used functions in the
>>> Prelude and other common modules, and so forth? The Haskell standard
>>> library is very large for a newcomer (even just the Prelude!), and as a
>>> learner of the language I find myself spending a lot of time looking up
>>> Prelude functions and syntax details -- having all of this in a short
>>> PDF document that I could have offline would be very useful.
>>>
>>
>> http://haskell.org/haskellwiki/Reference_card
>>
>> ?
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> 
>