Smalltalk-80 by A. Mevel, T. Gueguen, Mario Wolczko

By A. Mevel, T. Gueguen, Mario Wolczko

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The example can be made to run with: keyboard<- Keyboard new: 5. keyboard select: l. keyboard select: 4. Selection of key l of the keyboard will cause the message update: to be sent to all the other keys, which will deselect them whatever their status. 9 Primitive messages There are a certain number of primitive methods described in the class Object. These methods are: become:anObject allows the pointers of the receiver and of the argument anObject to be exchanged. All the variables that refer to the receiver will refer to the argument and vice versa.

Iself*(self - l) factorial When the expression 3 factorial is evaluated, self will represent 3 at the first pass. The method will request the response to the message (self- l) factorial, namely 2 factorial, and so on until 0 factorial. This may be shown diagrammatically as follows: 3 factorial self 3 self 2 2 factorial self l l factorial ~~ ~actorial self 0 i l i 2 i 6 When a message is sent to self, the search for the method corresponding to the message will begin in the 24 Smalltalk-80 class of the object referenced by self.

However, at this point we want to give the reader some elements so that he or she may test the examples that have already been presented and those that are to follow in the book. It is worth repeating once again that learning Smalltalk is best done in a practical context; this means that the support of a machine, while not absolutely necessary, is highly desirable for tackling the remainder of this book. PS4 created at (27 January 1987 2:25:53 :Atn ) Create File Synem Disk • "-ltofileOiroccory now.

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