Get Inside Smalltalk PDF

By Wilf R. Lalonde, John R. Pugh

A two-volume advisor to object-oriented programming that provides the Smalltalk approach as a strong and effective prototyping and improvement surroundings. quantity one introduces the basics of object-oriented programming and Smalltalk, describes the Smalltalk programming atmosphere and covers the language's simple and graphical sessions. It beneficial properties vast remedy of graphical and person interface sessions, info person sessions, together with relationships among comparable sessions and layout rationales. The publication has been written for use in parallel with the Smalltalk process.

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Fig. 16 illustrates the class hierarchy and the state of one instance for each of the three subclasses. All types of bank accounts support operations to query the balance of an account. If an operation has identical implementations in each subclass, we can implement the operation once only in the common superclass BankAccount and have the three subclasses inherit the operation. Other operations, such as querying the term of an account, will have to be specific to class TermDepositAccount. In some situations, a common operation that we might wish to implement once in a superclass may have to be duplicated in the subclasses if its implementation depends on die particular type of account.

All temporary variables are initially bound to the special object nil. In Smalltalk, the receiver of the isPrime message is called self. Explicitly assigning self to a local variable, as we did via assignment candidate <- self, is actually superfluous because self can be referenced anywhere in the method. However, it serves to make the Pascal and Smalltalk versions easier to compare. 5 User-Defined Control Structures No analog of the Pascal repeat ... until or case statements is provided in the Smalltalk system.

Code... ] In Smalltalk, control structures are implemented by passing messages to objects. Consequently, we can implement the do: for each different class of object that we would like to iterate over. This is a great advantage because control structures can be constructed not only to iterate over simple ranges of integers, but also to traverse such data structures as arrays, lists, trees, bank accounts, or circuit elements. 4 An Example: Testing for Primes To illustrate the equivalent of Pascal's nested control structures in Smalltalk and to discuss a larger example, we will consider the development of a Smalltalk fragment to test whether or not a given integer is prime.

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


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