Programming Programming Languages

A Mentoring Course on Smalltalk by Andrés Valloud

By Andrés Valloud

A developer constantly seeks higher knowing of software program engineering and layout. occasionally success intervenes and a mentor is helping to boost one's skills. besides the fact that, there are just such a lot of of those infrequent encounters, and hence, now not everyone seems to be afforded such possibilities. This ebook makes an attempt to take away good fortune as a proscribing 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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IfAllTrue: ifAllFalse: ifAnyTrue: ifAnyFalse: We can extend the pattern to two argument keyword messages. ifAllTrue:otherwise: ifAllFalse:otherwise: ifAnyTrue:otherwise: ifAnyFalse:otherwise: Colloquialisms that are not vague can help us to stay away from computer jargon, which tends to be removed from the issue at hand anyway. Notice the otherwise: wildcard that catches all the cases for which the first keyword did not apply. The keyword otherwise: itself is quite colloquial and almost informal.

For example, the lack of an explicit, early bound type system is a vital characteristic that keeps the cost of small changes at a low level. In the long run, this is far more important than preventing a few simple mistakes. From a technical point of view, if a Smalltalk program is written under these guidelines using very little code, it is hard to see why it should not succeed. 9 This excludes the possibility of the understanding of the problem itself changing, which from experience we know to be a very frequent event.

True], [true] [true], [false] [false], [true] [false], [false] Since it appears we will be referring to these conditions quite a bit, let’s give them the following names. ComplexConditionTestCase>>true ^[1 + 2 = 3] This is a perfect example of how implementing a message is being treated in terms of naming a specific object or a particular bit of behavior. ComplexConditionTestCase>>false ^[1 + 2 = 4] At first, these methods may seem to be too much pain for too little gain. However, they eliminate the need to write any redundant code and unnecessary square brackets in the methods below.

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