Foo-Oriented Software

September 5, 2007

Erlang is oh-so-hot at the moment (which must be a novel experience for such an old, mature language), but Tim Bray isn’t convinced: –

… I think that the human mind naturally thinks of solving problems along the lines “First you do this, then you do that” and thinks that Variables are naturally, you know, variable, and has grown comfortable with living in a world of classes and objects and methods.

This got me thinking. My reaction to Erlang variables was the same: “they’re not variables, why don’t you call them something else?”. I think the answer is basically that it’s easier to understand the concept by remembering them as variables that aren’t, rather than having to build up a whole new concept. The other thing about variables is that they’re not all that instinctive when you’re learning to program – they don’t work like in maths, so an expression looks like an equation, but doesn’t (in imperative languages) work like one. In Erlang, it does (or it fails ;-)).

It is practically impossible to teach good programming style to students that have had prior exposure to Basic; as potential programmers they are mentally mutilated beyond hope of regeneration. — Edsger Dijkstra

Most people start OO code by writing huge long main methods and writing most other code in static methods with some objects only if they need data structures, i.e. the most natural way to solve a problem is to start somewhere and perform a sequence of actions. So why use OO at all? To abstract the solution to solve a whole a family of problems, to decompose the problem to make it easier to solve and to make the solution easier to understand etc. The thing I like best about in Java is that it’s fairly easy to create code that can be easily understood by others. I suspect that this quality is at the root of Java’s adoption, and that the tools are as important as the language features (or lack thereof…); Javadoc’s contribution shouldn’t be underestimated.

More investigation is required to see how well Erlang does in creating comprehensible, reusable code!


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