By Andrés Valloud
A developer continuously seeks larger figuring out of software program engineering and layout. occasionally good fortune intervenes and a mentor is helping to boost one's talents. even though, there are just such a lot of of those infrequent encounters, and therefore, no longer everyone seems to be afforded such possibilities. This publication makes an attempt to take away success as a restricting issue for one's specialist development in Smalltalk by way of disseminating fabric discovered over a number of years of mentoring.
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Extra info for A Mentoring Course on Smalltalk
The implementation of behavior is a much more permanent expression of intention than a quick scribble. At the same time, it must allow change at a low cost. Therefore, there is no excuse for laziness nor carelessness. Names should not betray the private nature of implementation details either. For example, a message called singleton tells the senders that they will obtain the unique instance. This causes problems immediately. As long as senders of new receive an instance as advertised, why do they need to know it is a singleton?
TestExample self shouldnt: [SomeClass new performAction] raise: ActionException The intention of shouldnt:raise: is to fail if evaluating the block raises the exception given. This means that if performAction is not implemented, this test will pass because the exception corresponding to a message not being understood is not ActionException. What, if anything, is wrong with this? 22 CHAPTER 1. IT’S ALL IN A NAME Live Smalltalk exercises Solving these exercises will definitely require a computer.
SOME BEST PRACTICES SUMMARIZED 17 meant to be read and understood by people, it is extremely important that in every context from where messages are sent there are no more than 7 ± 2 top level distinctions 14 . This implies that any context with more than 7 ± 2 top level distinctions is hard to understand by definition. Therefore, we should take it easy and avoid asking too much of ourselves — let’s just settle on 7 as the maximum size of the contexts we can think of. Compliance The consequences are all-encompassing, devastating.