By Andrés Valloud
A developer constantly seeks larger knowing of software program engineering and layout. occasionally success intervenes and a mentor is helping to improve one's talents. even if, there are just such a lot of of those infrequent encounters, and therefore, now not everyone seems to be afforded such possibilities. This e-book makes an attempt to take away success as a restricting issue for one's specialist development in Smalltalk by means of disseminating fabric realized over numerous years of mentoring.
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Extra resources for A Mentoring Course on Smalltalk
This is an excellent example of the meaning of the message being determined by the context of the receiver. When there are many conditions, however, and: and or: foster deep block or parenthesis nesting. This makes debugging, maintaining and changing code unnecessarily difficult, as nesting causes mistakes to become very easy to make. A more subtle problem with and: and or: is that they are keyword messages. This means they get evaluated last, when usually the messages that need to be Note how making a decision can be thought of in terms of drawing a distinction.
Expression #(3 4), #(5) Value #(3 4 5) Condition collections could follow the same pattern, satisfying at the same time the requirement that conditions are evaluated in the order they are added. Expression [true], [false] Value a collection of conditions To allow collections with more than two conditions, both blocks and the collection will have to understand the comma message. In both cases, the argument will be a single block. Using polymorphism between the piece and the composite avoids parentheses by letting the meaning of the message be defined by the context in which it is received.
In fact, sometimes developers cheat and get around this limit by inlining several Smalltalk sentences into a long one when it is not absolutely necessary. Besides giving the impression of being clever, it is frequently argued that this style should be easier to understand. The justification used is that all the inlining causes things like temporary names to disappear, and in this way just a few names are used. However, this comes at the expense of referencing implicit objects inside parentheses, blocks, and arguments of keyword messages.
A Mentoring Course on Smalltalk by Andrés Valloud