I'd expect the instanceof check will be much more efficient than
catching an exception.
By far ...
From an OO design point of view, I'd add a billsOfMaterial() method
to the Part class that simply returns NSArray.emptyArray.
ManufacturedPart will then override this to return the correct
result for a ManufacturedPart.
Ew gross ... If it's not an attribute of all Parts, then from an OO
design standpoint it shouldn't be on Part. I agree if your argument
is based on "the convenience of being able to call billsOfMaterial on
the entire array," though.
ms
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