[Haskell-cafe] I just don't get it (data structures and OO)
Phlex at telenet.be
Sun Jun 3 03:24:58 EDT 2007
I'm coming from the OO world, and there's something i don't quite
understand in the way haskellers manipulate data (as all functional
programmers i guess).
Let's say i have a deep nested data structure.
Universe containing galaxies, containing solar systems, containing
planets, containing countries, containing inhabitants, containing
Using the OO paradigm, once i get a reference to an inhabitant, i can
update it quite easily (say by changing it's age), and that's the end of it.
On the other side, using the functional paradigm, it seems to me that
the function i use in order to create a _new_ inhabitant with a
different age will need to have knowledge of the country over it, the
planet ..and so on up to the universe...as i need to update all these
structures to reflect the change. This is pretty bad and most probably
doesn't need to be like this.
So here I am hoping for you all to give me some pointers on how this is
done "the functional way".
Thanks in advance
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