Read e-book online The Art and Science of Smalltalk PDF

By Simon Lewis

ISBN-10: 0133713458

ISBN-13: 9780133713459

This functional textual content presents an advent to programming in Smalltalk, and explains the best how you can take into consideration and paintings with the approach. cut up into components, the 1st half covers the $64000 technical history for programmers and executives, whereas the second one half introduces a number of the simple philosophy of Smalltalk. this article goals to demystify the transition from traditional programming to programming with Smalltalk. It incorporates a step by step advisor, taking the reader in the course of the fundamentals, through object-oriented programming with the Smalltalk language and its improvement atmosphere, correct as much as designing, coding and debugging courses.

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Extra info for The Art and Science of Smalltalk

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If there is no better 25 Chapter 4 name for a variable, it is usually named after its class, with a prefix of 'a' or 'an'. Long names are perfectly acceptable. In fact, they're encouraged because they make your code easier to read, and hence easier to reuse. Just as in all languages, the more descriptive you can make your names, the better. Literals and Constants Smalltalk provides a number of different sorts of literal. These are things like numbers and strings which you can include freely in programs just by typing them.

If when you get a notifier you select Debug, you will get a debugger window which is a very powerful tool that's actually a cross between a notifier, a browser and two inspectors. The next diagram shows a typical debugger window. At the top is a repeat of the stack back-trace leading up to the error. Each line shows a particular message being sent to a particular object. If you select a line you can browse the code involved in the middle pane. Here you can single-step the code (using the step button) or 'drill-down' into the messages being sent (using the send button).

To be sent to 34 The Smalltalk Language agenda, and then have the resulting object sent the message title: ' Plans' . Without the parentheses, the system would send the message item:? title: 'Plans' to agenda, which is not the same thing at all (because it is trying to invoke the single method ifcem:title! and not the separate methods item: and title:). This confusion arises because of the way Smalltalk embeds parameters within method names. The second way of combining messages in Smalltalk is called cascading.

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The Art and Science of Smalltalk by Simon Lewis

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