Download More Coding in Delphi by Nick Hodges PDF

By Nick Hodges

Like its predecessor Coding in Delphi, extra Coding in Delphi is ready writing Delphi code. during this ebook, you won’t locate a lot in regards to the shape clothier, the VCL, or the FMX framework. you'll, even though, know about: * easy methods to write strong code in Delphi * utilizing Delphi with layout styles just like the manufacturing facility, Observer, Adapter, Decorator, and Command styles. * easy methods to make the most of Operator Overloading to simplify your code * the right way to write multi-threaded and parallel code and make the most of the a number of cores on your CPU * the way to write Aspect-oriented code to aid separate your matters * The heritage of and an deep-dive into the area recognized TSmiley part

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Sure, we have more classes, but each is super easy to test, extending the system isn’t difficult at all, and the base class, TOrder, need not be changed at all even if we want to add a new way to discount items. So there you have a nice, clean example of being open for extension but closed for change – the Open/Closed Principle. Liskov’s Substitution Principle Liskov’s Substitution Principle is named after Barbara Liskov, the person who identified it. Liskov stated it quite formally: “Let q(x) be a property provable about objects x of type T.

Now, it took me a while to decipher that. Actually, I never did quite decipher it without some help. ” Basically, it means that you should design your system so that either a child class or any implementation of an interface can be substituted for either the base type or that given interface without things being screwed up. Writing SOLID Code 21 An example will be necessary here, I think. How about the classic TVehicle example? That is always prime for problems: TVehicle = class abstract procedure Go; virtual; abstract; procedure FillWithGas; virtual; abstract end; Okay, if you have a keen eye, you’ll already notice a problem here, but roll with me.

Ie=UTF8&camp=1789&creative=390957&creativeASIN=0596007124&linkCode= as2&tag=nickhodgeshomepa&linkId=6Z6LCYW3PPWNALT3 Factory Pattern Introduction In my previous book¹⁵ and even on my blog¹⁶, I’ve encouraged you not to create things manually. Instead, I’ve encouraged you to pass off the responsibility for creating things to some other class whose job is specifically to create things. The reason for this, of course, is that every call to Create causes a dependency and a coupling of code. Those things are best avoided.

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