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3 Object-Oriented Design |
To achieve reusability, extendibility and reliability, the principles of object-oriented design provide the best known technical answer.
An in-depth discussion of these principles fall beyond the scope of this introduction but here is a short definition:
Object-oriented design is the construction of software systems as structured collections of abstract data type implementations, or "classes".
The following points are worth noting in this definition:
Eiffel makes these techniques available to developers in a simple and practical way.
As a language, Eiffel includes more than presented in this introduction, but not much more; it is a small language, not much bigger (by such a measure as the number of keywords) than Pascal. It was meant to be a member of the class of languages which programmers can master entirely -- as opposed to languages of which most programmers know only a subset. Yet it is appropriate for the development of industrial software systems, as has by now been shown by many full-scale projects, some in the thousands of classes and hundreds of thousands of lines, in companies around the world.
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