Art and Science of Smalltalk, The by Simon Lewis

By Simon Lewis

Break up into elements, the 1st half (the technological know-how of SmallTalk) covers the $64000 technical history for programmers and bosses; whereas the second one half (the artwork of SmallTalk) introduces a number of the easy philosophy of SmallTalk. It encompasses a step by step consultant taking readers in the course of the basics--right as much as designing, coding, and debugging their very own courses.

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The procedural equivalent of this would be employs ('Aristotle', 'philosopher'). The last example just shows how this embedding of parameters can be extended to as many parameters as the method requires. In this case the method open:using:rwMode: takes three parameters: the string 'people, dat'; key (which is a variable); and 7 . The equivalent expression in a procedural language would be something like openUsingrwMode ('people, dat *, key, 7 ) . ) or period character. This is always necessary in Smalltalk if there are further message expressions to be evaluated, in order to separate one expression from the next.

On the left is a list of the instance variables in the object. Selecting one of these will display the current value of the variable in the right-hand part of the window. Each pane of the window has its own operate menu. On the left the menu usually just allows you to open another inspector (inspect) on the object contained in the selected instance variable. In A typical inspector, in this case inspecting an instance of class popUpMenu. 47 Chapter 5 the case of collection objects (see chapter 7) you will also be able to add and remove objects from the collection.

To understand how it works it is necessary to understand a few things about how the Smalltalk development environment organises classes and methods for browsing purposes. To make it easier to manage the hundreds of classes in the class hierarchy, they are grouped together into groups called categories. Each category contains classes which are related in terms of their purpose. It's important to realise that categories have nothing to do with inheritance. Categories are just arbitrary groups of classes intended to help human beings find their way around the class library.

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