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


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.

C-ORM: docs, API.

Last 100 entries

Consciousness From Max Entropy; Democrats; Harvard Will Fix Black Poverty; Modelling Bicycle Wheels; Amusing Polling Outlier; If Labour keeps telling working class people...; Populism and Choice; Books on Defeat; Enrique Ferrari - Argentine Author; Transcript of German Scientists on Learning of Hiroshima; Calvert Journal; Telephone System Quotes for Cat Soft LLC; Owen Jones on Twitter; Telephone System Quotes for Cat Soft LLC; Possible Japanese Authors; Complex American Literature; Chutney v5; Weird Componentized Virus; Interesting Argentinian Author - Antonio Di Benedetto; Useful Thread on MetaPhysics; RAND on fighting online anarchy (2001); Now Is Cat Soft LLC's Chance To Save Up To 32% On Mail; NSA Hacked; Call Center Services for Cat Soft LLC; Very Good LRB Article on Brexit; Nussbaum on Anger; Credit Card Processing for Cat Soft LLC; Discover new movies on demand in our online cinema; Tasting; Credit Card Processing for Cat Soft LLC; Apple + Kiwi Jam; Hit Me; Increase Efficiency with GPS Vehicle Tracking for Cat Soft LLC; Sudoku - CSP + Chaos; Recycling Electronics In Santiago; Vector Displays in OpenGL; Call Center Services for Cat Soft LLC; And Anti-Aliased; OpenGL - Render via Intermediate Texture; And Garmin Connect; Using Garmin Forerunner 230 With Linux; Payroll Service Quotes for Cat Soft LLC; (Beating Dead Horse) StackOverflow; Current State of Justice in China; Now Is Cat Soft LLC's Chance To Save Up To 32% On Mail; Axiom of Determinacy; Ewww; Fee Chaos Book; Course on Differential Geometry; Increase Efficiency with GPS Vehicle Tracking for Cat Soft LLC; Okay, but...; Sparse Matrices, Deep Learning; Sounds Bad; Applebaum Rape; Tomato Chutney v4; Have to add...; Culturally Liberal and Nothing More; Weird Finite / Infinite Result; Your diamond is a beaten up mess; Maths Books; Good Bike Route from Providencia / Las Condes to Panul\; Iain Pears (Author of Complex Plots); Plum Jam; Excellent; More Recently; For a moment I forgot StackOverflow sucked; A Few Weeks On...; Chilean Book Recommendations; How To Write Shared Libraries; Jenny Erpenbeck (Author); Dijkstra, Coins, Tables; Python libraries error on OpenSuse; Deserving Trump; And Smugness; McCloskey Economics Trilogy; cmocka - Mocks for C; Concept Creep (Americans); Futhark - OpenCL Language; Moved / Gone; Fan and USB issues; Burgers in Santiago; The Origin of Icosahedral Symmetry in Viruses; autoenum on PyPI; Jars Explains; Tomato Chutney v3; REST; US Elections and Gender: 24 Point Swing; PPPoE on OpenSuse Leap 42.1; SuperMicro X10SDV-TLN4F/F with Opensuse Leap 42.1; Big Data AI Could Be Very Bad Indeed....; Cornering; Postcapitalism (Paul Mason); Black Science Fiction; Git is not a CDN; Mining of Massive Data Sets; Rachel Kaadzi Ghansah; How great republics meet their end; Raspberry, Strawberry and Banana Jam; Interesting Dead Areas of Math; Later Taste; For Sale

© 2006-2015 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.


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

- 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


Comment on this post