Hello Phlex, Sunday, June 3, 2007, 12:34:26 PM, you wrote:
So i need to do something like this :
changePlanetAge universe galaxy planet age = ...lots of code, returning a new universe And the same code for all functions updating any of the properties of my planet ... And the same code for all functions updating properties of a country on this planet...
while in the OO paradigm, i only need to do
changlePlanetAge planet age = ...just what you wrote
i think that problem is that you think in imperative paradigm. you want to update the whole universe structure each time when one children is born. the solution is to work on lower levels and change your algorithms to group changes in substructures together just one example: i parse config file in my program, i.e. i need function that returns setting given section and entry name: configData configFileContents sectionName entryName in imperative paradigm i will probably scan whole file each time i need an entry. in Haskell, i just split the whole config file into sections and extract entries from appropriate sections. imagine the opposite task, i will probably group entries together and concat them into sections and then concat sections into the whole config file while in imperative programming each new update will change the global structure change your mind, Neo! ;) -- Best regards, Bulat mailto:Bulat.Ziganshin@gmail.com