On Aug 23, 2010, at 9:40 AM, laurent laffont wrote:

Indeed ��I don't like ��'2010/08/01' asTime, but I like 3 seconds.

And I think the reason is the following:

��'2010/08/01' asTime

this is just code... "string, you smalltalk object, please convert yourself into an object of another class that

you normally should know too much about". No reason why not to ask the Time class: hey, time,

I have a string, can you make a time for me? And it's even nicer... Time knows about time, string

about being a string.

BUT:

1 second + 3 hours

This is different. This is a *domain specific language* for dealing with time. When you read that, you do

not think in term of general smalltalk code for coverting between classes. We are (kind of) outside of

our language��model and the rules we normally follow do not apply.��(e.g. there is no hour and second��class...).��

Domain specific languages are powerful, and one can abuse them very easily.��

(am guilty of having written once some awful DSL where even the *name* of a block��

parameter had semantic��meaning ;-)

���� �� �� �� Marcus

--

Marcus Denker ��--��http://www.marcusdenker.de
INRIA Lille -- Nord Europe. Team RMoD.

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