Download e-book for kindle: Art and Science of Smalltalk, The by Simon Lewis

By Simon Lewis

Cut up into components, 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 a few of the uncomplicated philosophy of SmallTalk. It features a step by step consultant taking readers during the basics--right as much as designing, coding, and debugging their very own courses.

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Additional resources for Art and Science of Smalltalk, The

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A debugger opened after the system has failed to understand the message start. 49 Chapter 5 Trying Things Out If you haven't already done so, now is probably a good time to actually sit in front of your Smalltalk system and explore a few of the things we've been talking about so far. It's really up to you to test and enhance your understanding by trying out whatever you like. Here are some simple ideas if you're stuck for somewhere to start though. First of all, try evaluating some simple message expressions in a workspace window (you can open a workspace from the launcher).

The value can be any object. So, if you have a variable called origin for example, it can hold a floating point number, or a date, or a menu, or any other kind of Smalltalk object. As in other languages you still have to declare the variable, but all you have to do is give it a name, not a type. ' This typelessness can seem very distressing at first, and even unsafe. In fact, it is a key contributor to the flexibility and power of 27 Smalltalk code. It facilitates the use of the polymorphism we looked at in Chapter 2, and really doesn't cause the kind of bugs you might imagine.

When a protocol has been selected the right-most pane will contain a list of all the methods in that protocol. Finally, selecting a method displays its source-code in the large lower pane of the system browser window. You will have noticed that below the list of classes is a pair of radio buttons which are rather confusingly labelled instance and class. These buttons control whether the browser is looking at instance methods or class methods. This distinction is sometimes referred to as the 'instance-side' versus the 'class-side*.

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