| Andrew Cooke | Contents | Latest | RSS | Twitter | Previous | Next

C[omp]ute

Welcome to my blog, which was once a mailing list of the same name and is still generated by mail. Please reply via the "comment" links.

Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

Personal Projects

Lepl parser for Python.

Colorless Green.

Photography around Santiago.

SVG experiment.

Professional Portfolio

Calibration of seismometers.

Data access via web services.

Cache rewrite.

Extending OpenSSH.

Last 100 entries

Data Mining Books; SimpleDateFormat should be synchronized; British Words; Chinese Govt Intercepts External Web To DDOS github; Numbering Permutations; Teenage Engineering - Low Price Synths; GCHQ Can Do Whatever It Wants; Dublinesque; A Cryptographic SAT Solver; Security Challenges; Word Lists for Crosswords; 3D Printing and Speaker Design; Searchable Snowden Archive; XCode Backdoored; Derived Apps Have Malware (CIA); Rowhammer - Hacking Software Via Hardware (DRAM) Bugs; Immutable SQL Database (Kinda); Tor GPS Tracker; That PyCon Dongle Mess...; ASCII Fluid Dynamics; Brandalism; Table of Shifter, Cassette and Derailleur Compatability; Lenovo Demonstrates How Bad HTTPS Is; Telegraph Owned by HSBC; Smaptop - Sunrise (Music); Equation Group (NSA); UK Torture in NI; And - A Natural Extension To Regexps; This Is The Future Of Religion; The Shazam (Music Matching) Algorithm; Tributes To Lesbian Community From AIDS Survivors; Nice Rust Summary; List of Good Fiction Books; Constructing JSON From Postgres (Part 2); Constructing JSON From Postgres (Part 1); Postgres in Docker; Why Poor Places Are More Diverse; Smart Writing on Graceland; Satire in France; Free Speech in France; MTB Cornering - Where Should We Point Our Thrusters?; Secure Secure Shell; Java Generics over Primitives; 2014 (Charlie Brooker); How I am 7; Neural Nets Applied to Go; Programming, Business, Social Contracts; Distributed Systems for Fun and Profit; XML and Scheme; Internet Radio Stations (Curated List); Solid Data About Placebos; Half of Americans Think Climate Change Is a Sign of the Apocalypse; Saturday Surf Sessions With Juvenile Delinquents; Ssh, tty, stdout and stderr; Feathers falling in a vacuum; Santiago 30m Bike Route; Mapa de Ciclovias en Santiago; How Unreliable is UDP?; SE Santiago 20m Bike Route; Cameron's Rap; Configuring libxml with Eclipse; Reducing Combinatorial Complexity With Occam - AI; Sentidos Comunes (Chilean Online Magazine); Hilary Mantel: The Assassination of Margaret Thatcher - August 6th 1983; NSA Interceptng Gmail During Delivery; General IIR Filters; What's happening with Scala?; Interesting (But Largely Illegible) Typeface; Retiring Essentialism; Poorest in UK, Poorest in N Europe; I Want To Be A Redneck!; Reverse Racism; The Lost Art Of Nomography; IBM Data Center (Photo); Interesting Account Of Gamma Hack; The Most Interesting Audiophile In The World; How did the first world war actually end?; Ky - Restaurant Santiago; The Black Dork Lives!; The UN Requires Unaninmous Decisions; LPIR - Steganography in Practice; How I Am 6; Clear Explanation of Verizon / Level 3 / Netflix; Teenage Girls; Formalising NSA Attacks; Switching Brakes (Tektro Hydraulic); Naim NAP 100 (Power Amp); AKG 550 First Impressions; Facebook manipulates emotions (no really); Map Reduce "No Longer Used" At Google; Removing RAID metadata; New Bike (Good Bike Shop, Santiago Chile); Removing APE Tags in Linux; Compiling Python 3.0 With GCC 4.8; Maven is Amazing; Generating Docs from a GitHub Wiki; Modular Shelves; Bash Best Practices; Good Emergency Gasfiter (Santiago, Chile); Readings in Recent Architecture; Roger Casement; Integrated Information Theory (Or Not)

© 2006-2013 Andrew Cooke (site) / post authors (content).

OOPSLA / Wadler / Generics

From: "andrew cooke" <andrew@...>

Date: Sat, 28 Oct 2006 17:16:17 -0300 (CLST)

I enjoyed this talk, but I don't think it went down so well for many in
the audience; I also think he ran out of time and the final point (which
is very interesting) got kind-of lost.

Anyway, it was pretty damn cool to get a basic lesson in logic from the
big cheese.  Even if it's also frustrating that the kind of thing that
took me a fair amount of effort to teach myself is so obvious after just a
few minutes of a lecture (how much I must still not know....)

The thread of the talk started with Haskell type classes, and then
compared those to Java Generics.  One difference (apart from the many
extensions in Haskell) was that Java's implementation through type erasure
is pretty useful - allows separate compilation, backwards and future
compatibility, etc.

[This is where his time ran out].  The last few slides introduced Links,
which is a "full stack" language that includes DB, business and
presentation. In other words, one language compiles, depending on the
area, into SQL, server code (Haskell?), or Javascript for the client. 
Which is pretty neat. And which is (I think - this wasn't clear) only
possible because it adapts Haskell's type classes so that they can be
implemented through erasure (basically by dispatching on the first type,
afacit).  In other words, while the "upper" language is statically typed,
it can compile "down" to a dynamically typed (tagged) core.  And so works
on Javascript.

Which is pretty cool.

Andrew

Clarifications on Wadler

From: "andrew cooke" <andrew@...>

Date: Mon, 6 Nov 2006 19:33:58 -0300 (CLST)

The previous post was written in a hurry (everything from OOPSLA was). 
Some clarification might help:

- The slides are at
http://homepages.inf.ed.ac.uk/wadler/topics/gj.html#oopsla

- He has a book out on Java Generics.

- The server level language for Links is Java.  There's more info on Links
at http://groups.inf.ed.ac.uk/links/

- Erlang is also in the mix (the paper at
http://groups.inf.ed.ac.uk/links/papers/links-esop06.pdf mentions sending
messages to mailboxes).

- As far as I know, Java Generics are equivalent to normal polymorphism in
Haskell; Haskell's type classes are similar to the normal class-based
method dispatch in Java.  At least, that's my understanding.  However, the
talk says that the focus is on second order quantification in both
languages.  So I am wrong about something.

  Perhaps my mistake is in comparing polymorphism to generic types.  If
you ignore that (apparent) relationship, things make more sense, because
type classes are like genrics too - "Ord a" is pretty similar to
"SortedSet<a>".

Andrew

Comment on this post