Inside Smalltalk by Wilf R. Lalonde, John R. Pugh

By Wilf R. Lalonde, John R. Pugh

A two-volume advisor to object-oriented programming that provides the Smalltalk method as a strong and effective prototyping and improvement surroundings. quantity one introduces the basics of object-oriented programming and Smalltalk, describes the Smalltalk programming setting and covers the language's easy and graphical sessions. It beneficial properties huge therapy of graphical and consumer interface sessions, info person periods, together with relationships among similar periods and layout rationales. The booklet has been written for use in parallel with the Smalltalk process.

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Pascal style unary operations are not available in the traditional syntax. The following example shows a unary minus operation. 26 Inside Smalltalk Commentary Smalltalk 3 negated -3 no equivalent +3 The message consisting of the selector negated is sent to the integer 3. The integer object -3 is returned as the result. 2 Binary Messages In addition to the receiver, binary messages have a single argument. They are equivalent to Pascal binary operations. The selectors for binary messages are special single or double characters.

Divisor <- 3. [divisor • divisor <= candidate] whileTrue: [ (candidate^ divisor) = 0 ifTrue: [Tfalse] if False: [divisor <— divisor 4- 2]]. Ttrue Several explanatory comments are required to understand the Smalltalk code. But first note that the Smalltalk code is more concise than the Pascal code — primarily because of Pascal's inability to terminate evaluation of a function before the end. In Smalltalk, an expression preceded by an up arrow (T) is termed a return expression. A return expression indicates that the result of evaluating the expression following the up arrow is the result to be returned and evaluation of the code is to terminate.

In the second, the receiver is the point with x and y coordinates equal to 200 (the binary selector @ when sent to an integer creates an initialized instance of the Smalltalk class Point). In this expression, the selector + is interpreted as indicating addition defined on points. The point with x and y coordinates equal to 300 is returned. As we discussed earlier, it is the receiver of the message that determines how the message is to be interpreted. This means that the same message sent to different objects will produce different results.

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