Coding In Delphi by Nick Hodges

By Nick Hodges

Coding in Delphi is a brand new programming publication via Nick Hodges that covers quite a few robust Delphi programming good points and strategies together with Generics, Interfaces, Exception, dealing with, nameless tools, Collections, RTTI, Enumerators, Attributes, Dependency Injection and Unit trying out

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The first one – the type-casting way – requires lots of specific type-casting which may seem okay, but really isn’t something that you should be doing at all. In addition, it breaks the notion of encapsulation by playing fast and loose with the types being managed in a class. The other requires the creation and maintenance of a bunch of very similar classes. Plus, the work never ends, because you may come across new things that you want to store in a stack, meaning you need to create a new class for each one of them.

Example: Corvettes can be substituted for Cars). That is, you can use a child class in place of a parent class because the child class has everything that the parent class has. Likewise, contravariance is the notion that the general type can be substituted for the specific type. (Example, a car can replace a Corvette) Contravariance is a little trickier, and normally not allowed in object-oriented systems, because a child class can have more functionality than a parent class, and thus a parent class cannot be a perfect substitute for the child class if the child instance uses that additional functionality.

Well, there are a number of reasons: • You can have one class that will handle any type. No more TButtonStack and TStringStack and TIntegerStack and all that. You merely have one TStack to use and maintain. That is less code to worry about. • You aren’t duplicating code. This is good for many reasons, including a single point of failure and a single point to fix that failure. Having to fix the same bug in many places is inefficient, no fun, and error-prone. One class for any type is much easier to handle than many, one-type classes.

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