Next our example has us calling WrittenBy. Well, the BookBuilder class doesn’t define that method. In a normal application we’d probably just add the method to BookBuilder, but that wouldn’t let us play with extension methods here, so let’s pretend that the BookBuilder class is defined by some code we don’t control and can’t modify.
It's a very valid question. The answer is "I need to teach extension methods". If you have full control of all code, you're better off putting it in BookBuilder.
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(I emphasised the main purpose)
It's a very valid question. The answer is "I need to teach extension methods". If you have full control of all code, you're better off putting it in
BookBuilder.