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 $64000 technical historical past for programmers and executives; whereas the second one half (the paintings of SmallTalk) introduces the various uncomplicated philosophy of SmallTalk. It features a step by step advisor taking readers during the basics--right as much as designing, coding, and debugging their very own courses.

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Extra resources for Art and Science of Smalltalk, The

Sample text

The notifier contains a stack backtrace which, if you know how to interpret it, will tell you exactly the situation which led up to the error. The notifier also offers you the opportunity to do various things including attempt to proceed, open a debugger window (see below) or simply terminate the execution of your code, returning to the development environement. In earlier versions of Smalltalk, these options were on a pop-up menu, whilst the latest version of VisualWorks puts them on push buttons.

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). You can also modify the code (by editing it and using accept from the pop-up menu), and continue execution.

Built using those classes is a set of tools which provide a powerful development environment for Smalltalk programmers. In a very real way, your task when programming in Smalltalk is to take that system, and extend it to turn it into what you want it to be. Unlike in other languages, there is no 'wall' between you and the system. You have all the same power and flexibility that the developers of the system itself enjoy. Implementation of the Smalltalk System When you program in C, Pascal, or many other languages, you usually think of your finished program as running straight on the hardware of your computer (albeit with the help of the operating system).

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