Download Art and Science of Smalltalk, The by Simon Lewis PDF

By Simon Lewis

Cut up into elements, the 1st half (the technological know-how of SmallTalk) covers the real technical historical past for programmers and bosses; whereas the second one half (the artwork of SmallTalk) introduces the various easy philosophy of SmallTalk. It contains a step by step advisor taking readers in the course of the basics--right as much as designing, coding, and debugging their very own courses.

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Extra info for Art and Science of Smalltalk, The

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This applies in the transcript, browsers, inspectors, debuggers, even in windows which you yourself create. Of course, things can get very untidy if you go typing random bits of Smalltalk in every window, but it can be useful not to have to find or open a workspace just to execute a single line. Just type it in any window, select it, and do it. Earlier versions of VisualWorks also provided something called a system -workspace. This is just like an ordinary workspace, except that it is pre-filled with all sorts of useful code fragments for you to use.

Just as in other languages, parentheses can be used to change the order of evaluation. In this case the expression in the inner-most parentheses is evaluated first (according to normal Smalltalk rules). Here are some examples: MyCollection add: Pyramid new initialize. (book openAtPage: 1+2*3) print. ) title: "Plans'. In the first case the message new is sent to Pyramid. The resulting object is sent the message initialize. The object which is returned by initialize is then used as a parameter in the message add: sent to MyCollection.

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. It is optional if there are no further message expressions being evaluated (for example, at the end of a method, or at the end of a single line of code being executed interactively). In Smalltalk, every message expression has a value.

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