Chalten is also a brilliant framework.Anyone using the old calendar framework from Smalltalk should take a look at it. Cheers r 2009/10/9 Hernan Wilkinson <hernan.wilkinson@gmail.com>
We did that in a financial system that uses Aconcagua and Chalten.... so you have things like:
InterestRate yearlyOf: 10 percent. InterestRate of: 10 percent every: 6 months.
and of course:
Interest simpleFor: 100 dollars with: (InterestRate yearlyOf: 10 percent) during: 10 years. and Interest compoundFor: 100 dollras with: (InterestRate yearlyOf: 10 percent) during: 10 years withPeriodsOf: 6 months
And of course more complex things... anyway, some people call this DSL... :-)
On Fri, Oct 9, 2009 at 10:19 AM, Torsten Bergmann <astares@gmx.de> wrote:
Reminds me again how close Smalltalk comes to the real world.
Dont know if the interest rate of 0.1 is still valid after the financial crisis ;) but I always liked this natural expression style of Smalltalk:
initialCapital := 100 dollars. interestRate := 0.1 / 1 year.
Especially the ease of "1 year", "1 month" or "Date today". If you ever worked with the date and calendar mess in Java you know what I'm talking about. I can even write:
100 m2 100 USD 100 EUR 100 â¬
Unfortunately I cant (yet) write unary messages like this in Smalltalk:
100 $ 100 %
Wonder why not. Parser gives "Message pattern expected", maybe because of unary vs. binary.
Have to think about it ...
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