[Pharo-project] could we agree to remove caseOf: and caseOf:otherwise:

Miguel Cobá miguel.coba at gmail.com
Sun Feb 13 02:46:33 CET 2011


El dom, 13-02-2011 a las 02:26 +0100, Levente Uzonyi escribió:

> I know what's premature optimization.

It appear that you know but doesn't understand. See below.

>  What I do differently than other 
> people (including you) is:
> - if I can choose from different solutions for some problem, then I 
> usually pick the one with the best expected performance if it has neglible 
> other extra cost (complexity, readability, size, etc) compared to other 
> solutions. E.g.: I usually write 1 to: 10 do: instead of (1 to: 10) do:,
> foo ifNotNil: [ ... ] instead of foo ifNotNilDo: [ ... ] or foo isNil 
> ifFalse: [ ... ]), etc.

This *is* premature optimization. Why? because you're programming with
the performance in mind *all* the time, since the first second you start
programming!

And not only that, it relies on a specific VM implementation, the squeak
one. Presumes that the given messages are *more efficient* (just because
you know that the squeak compiler/vm combination makes them so). But
this could be wrong or at least useless in other vm (like GNU or
Gemstone). So by definition it is premature optimization.

Lastly, to program like you (and not like others, Igor and I and most
people I think) we should have in the head the specifics of the vm
implementation and a handy list of the inlined messages of the vm.
This is the job of the JIT, not from the developer!


> - I optimize library code which is expected to be heavily used

This the time and usage will tell


> - I like to optimize code

Prematurely it appears!

Cheers

-- 
Miguel Cobá
http://twitter.com/MiguelCobaMtz
http://miguel.leugim.com.mx







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