Hi Yaron,
You've slightly misunderstood my suggestion. I hope this will shed
some reasoning on it:
In OO, what you are effectively doing is this:
The Object represents the "environment" under which you do your
calculations.
The "environment" object is created by your constructor.
Once this "environment" has been created, you can use it to do
calculations using "foo.tax_deductible_expenses(1)".
My example is meant to capture this style of programming. (Whether
this style is appropriate is up to you to decide.)
The "environment" is represented by a map.
You can write a function that creates an "environment" just like how
you can write a constructor to create an environment object in Java.
eg. new-environment( ... )
Once this environment has been created, you may use it to do
calculations using
"(in-environment foo
(tax-deductible-expenses 1))"
The in-environment macro is not meant to contain any logic. It is
solely meant to save you some typing.
Hope that's more clear.
-Patrick
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