The purpose of an object-based design is to allow the components to be as modular as possible. In particular, when a new object type is created, it is expected that it should work without problem when placed in a different environment or new programming project. The benefits of this approach are a shorter development time and easier debugging, because you're re-using program code that has already been proven. This 'black box' approach means that data goes into the Object and other data comes out of the Object, but what goes on inside isn't something you need to concern yourself with.
The philosophy of object-based programming says that program code should be as modular as possible. Once you've written and tested a function, it should be possible to slot it into any program or script needing that kind of functionality and just expect it to work, because it's already been tried and tested on an earlier project.
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