From: Brian Rogoff <bpr@best.com>
To: leary@nwlink.com
Cc: Hao-yang Wang <hywang@pobox.com>, caml-list@inria.fr
Subject: Re: [Caml-list] Hitchhiker's Guide to Typing
Date: Mon, 11 Jun 2001 09:43:02 -0700 (PDT) [thread overview]
Message-ID: <Pine.BSF.4.21.0106110915320.985-100000@shell5.ba.best.com> (raw)
In-Reply-To: <20010608163211.B15375@jean>
On Fri, 8 Jun 2001 leary@nwlink.com wrote:
> On Fri, Jun 08, 2001 at 01:22:05PM -0700, Hao-yang Wang wrote:
> > I think by "type theory" you mean the type systems used in modern
> > programming languages. Luca Cardelli has written some nice
> > tutorial/survey on this topic.
> >
> > See <http://www.luca.demon.co.uk/Bibliography.html>. Look for the
> > articles "Typeful programming" and "Type systems".
If, like me, you like to see a working implementation, then download a
copy of "Basic Polymorphic Typechecking" from this page. Also, Michael
Schwartzbach wrote a nice little tutorial called "Polymorphic Type
Inference" which you can get here
http://www.brics.aau.dk/BRICS/LS/95/3/BRICS-LS-95-3/BRICS-LS-95-3.html
There are little parts of this that I think could be better, but overall
I like it best. If you work through it you'll learn a lot.
> Seems to beg the questions tho': Is it not possible to learn and use OCaml
> without wading through 60 page docs on typing?
Sure. But you'll understand these things a lot better if you apply
yourself and read some of these papers. I agree that many of the papers
go too deep too fast.
> Will I have to read more of these papers to learn the object
> system? Modules?
No, but once again you'll learn a lot from the papers. For objects and
modules
http://caml.inria.fr/~remy/cours/appsem/
http://caml.inria.fr/~xleroy/publi/modular-modules-jfp.ps.gz
> I'm willing to read up on typing, since it seems pretty important to
> getting a good handle on FPLs/OCaml, and that's definitely what I'm after,
> but I wonder (in advance) if 60 pages can't be turned into far fewer. I'd
> like some feedback on the notion that "if you can't explain it to a
> five-year-old, you don't really understand it"
That notion is nonsense. I understand differential calculus quite well,
and I doubt I could explain it to a five year old. In fact, as a TA for
an introductory numerical analysis class at Snodfart (name changed to
protect the guilty :) I gave a simple explanation of Taylor's Theorem to a
masters student in CS who just couldn't get it. Not a very good student,
no doubt, but probably better equipped than a five year old.
> (or, rather, haven't given the simplest, most concise, most practically
> useful explanation). By way of a couple examples, the HHGTTG entry for
> Earth is "mostly harmless". Investing can be distilled down to "buy
> low, sell high". Not crashing a motorcycle is a matter of "look where
> you want to go, don't look at the ground".
None of these are useful. My explanation for everything can be distilled
to "Shit happens", but that's also not very useful.
> Of course, a working knowledge of typing will never be so simple, but
> contrast, for example, the "Type Systems" doc above; Table 34 is a good
> place to look.
I've got a copy of Stroustrup's "The C++ Programming Language" here. That's
not simple. Nor is Wall's Perl book, nor the Common Lisp Hyperspec, nor
the Ada 95 LRM.
If you want a working knowledge of OCaml, write lots of code. Use the
papers to flesh out that working knowledge to a deeper understanding.
-- Brian
-------------------
Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/
To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr
next prev parent reply other threads:[~2001-06-11 16:43 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-06-08 20:22 Hao-yang Wang
2001-06-08 23:32 ` leary
2001-06-09 0:41 ` [Caml-list] " Joseph R. Kiniry
2001-06-11 16:43 ` Brian Rogoff [this message]
2001-06-11 18:22 ` [Caml-list] " Jonathan Coupe
2001-06-11 21:05 ` [Caml-list] " Joseph R. Kiniry
2001-06-11 21:19 ` [Caml-list] " David Fox
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Pine.BSF.4.21.0106110915320.985-100000@shell5.ba.best.com \
--to=bpr@best.com \
--cc=caml-list@inria.fr \
--cc=hywang@pobox.com \
--cc=leary@nwlink.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).