New PDF release: Art and Science of Smalltalk, The

By Simon Lewis

ISBN-10: 0133713458

ISBN-13: 9780133713459

Break 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 a number of the simple philosophy of SmallTalk. It features a step by step advisor taking readers throughout the basics--right as much as designing, coding, and debugging their very own courses.

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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. 07 Notice that Smalltalk can handle integers, floating point numbers, and slightly unusually, fractions. You need to be aware of this because if a ' fraction is the most accurate way of representing a number, that is what Smalltalk will do unless you ask otherwise.

However, because it's the same virtual computer that's being implemented by the VM, the identical image file will run on any implementation of the VM. To port your program between platforms 20 An Introduction to Smalltalk Smalltalk Virtual Image The Smalltalk system consists of a virtual image and a virtual machine running on your computer. you simply the copy the image! To achieve this consistency, the VM implements its own set of basic operations, including arithmetic, logical and I/O operations.

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.

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Art and Science of Smalltalk, The by Simon Lewis


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