The only one of those I am not sure about is the natural hierarchy/inheritance one. The big problem is the LSP and often data that seems to follow a natural hierarchy (a square is a rectangle) in fact violates the LSP.

Hmm, could you elaborate on this? As I understand it, the LSP stipulates that a property that holds for objects of a given type must not fail for objects of a subtype thereof.

So suppose that you've got a class Rectangle, and a subclass Square. What property would be provable about instances of Rectangle that isn't provable about instances of Square? You can prove additional facts about the latter, of course, but I'm not seeing any property that's lost by transitioning from (general) rectangles to squares.

In reply to Re^3: When to Use Object Oriented approach in Perl? (RFC) by AppleFritter
in thread When to Use Object Oriented approach in Perl? (RFC) by thanos1983

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