[Haskell-cafe] "Write Yourself a Scheme in 48 Hours"
Shannon -jj Behrens
jjinux at gmail.com
Fri Feb 2 15:30:46 EST 2007
On 2/1/07, Bryan O'Sullivan <bos at serpentine.com> wrote:
> Shannon -jj Behrens wrote:
> > I'm going through the "Write Yourself a Scheme in 48 Hours"
> > <http://halogen.note.amherst.edu/~jdtang/scheme_in_48/tutorial/overview.html>
> > tutorial. I like it a lot, but I have some concerns. Are the
> > exercises in the tutorial known to be solvable by mere mortals?
> The answer seems to be "yes, iff the mortals in question have grasped
> the basics of monads, so they can fill in the gaps in the exposition."
> > For instance:
> > "Rewrite parseNumber using...explicit sequencing with the >>= operator"
> > http://halogen.note.amherst.edu/~jdtang/scheme_in_48/tutorial/parser.html#symbols
> > There aren't any examples of using >>= previous to this question.
> There's a peculiar mixture of assumptions in the article. He treats
> monads breezily, as if they're a given; but pattern matching (much more
> basic) receives some rather more detailed exposition. And he glosses
> over ">>", but doesn't mention the rewrite rule from "a<-x" to "x>>=\a->".
> So don't beat yourself up. The tutorial is missing a few bits and pieces.
Thanks. That's all I needed to hear :)
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