e-book Smalltalk-80: The Interactive Programming Environment (Addison-Wesley series in computer science)

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The code and the book as a single file containing everything are available. Thank again Lukas Renggli for his effort for converting everything from Word.

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Not all the publishers are that open-minded. This book provides a good survey of Smalltalk. Some information are now obsolete but it is still worth reading. Enjoy it. Thanks John to support our request. We want to thank Springer Verlag Publishing for allowing us to give you this book for free. Smalltalk V Tutorial. This book is for collectors. The quotes are really excellent.

All the chapters are ready except chap. Thanks Ted. It contains a lot of useful material. Thanks again ivan and continue to write good books. Thanks Glenn.

Smalltalk-80: The Interactive Programming Environment (Addison-Wesley series in computer science)

Thanks Adele. This book presents object-oriented programming in german with VisualWorks. Community Reviews. Showing Rating details. Sort order. Aug 04, Steve rated it it was amazing. I wish more programming language books were like this. It's broken down into three parts: 1 Teaching you the concepts and syntax of the language 2 Illustrated and annotated guide to system internals written in the language you just learned 3 Examples for how to design and build moderate sized applications.

You've gone from rank beginner to intermediate programmer in one book. You'll understand various parts of the class library and you'll be on your way to working on your own applications. Nov 09, Nick Black rated it liked it Shelves: likely-reread. The canonical reference to Smalltalk Our professor was a trickster, saying Squeak was what we'd need, but what Squeak 'ere had to do with OOP was beyond my sight to see.

Oh mothers, tell your children not to do as I have done: Wrec The canonical reference to Smalltalk Oh mothers, tell your children not to do as I have done: Wreck their lives in pastel misery, using VM's that Guzdial runs.

View 1 comment. Feb 16, Adolfo rated it really liked it Shelves: smalltalk , programming. A great book, both from the historical and technical perspective, being one of the most complete descriptions of the Smalltalk language you'll find around. Each particular window object would have its own values of those properties, and each of them would be able to perform operations defined by its class.

The state an object holds is always private to that object. Other objects can query or change that state only by sending requests messages to the object to do so. Any message can be sent to any object: when a message is received, the receiver determines whether that message is appropriate.

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In Smalltalk, primitive values such as integers, booleans and characters are also objects, in the sense that they are instances of corresponding classes, and operations on them are invoked by sending messages. A programmer can change or extend through subclassing the classes that implement primitive values, so that new behavior can be defined for their instances—for example, to implement new control structures—or even so that their existing behavior will be changed.

This fact is summarized in the commonly heard phrase "In Smalltalk everything is an object", which may be more accurately expressed as "all values are objects", as variables are not. Since all values are objects, classes are also objects. Each class is an instance of the metaclass of that class. Metaclasses in turn are also objects, and are all instances of a class called Metaclass.

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Code blocks —Smalltalk's way of expressing anonymous functions —are also objects. Reflection is a term that computer scientists apply to software programs that have the ability to inspect their own structure, for example their parse tree or data types of input and output parameters. Reflection is a feature of dynamic, interactive languages such as Smalltalk and Lisp.

Reflection is also a feature of having a meta-model as Smalltalk does. The meta-model is the model that describes the language, and developers can use the meta-model to do things like walk through, examine, and modify the parse tree of an object. Or find all the instances of a certain kind of structure e. Smalltalk is a totally reflective system, implemented in Smalltalk Smalltalk provides both structural and computational reflection. Smalltalk is a structurally reflective system which structure is defined by Smalltalk objects.

The classes and methods that define the system are also objects and fully part of the system that they help define. The Smalltalk compiler compiles textual source code into method objects, typically instances of CompiledMethod. These get added to classes by storing them in a class's method dictionary. The part of the class hierarchy that defines classes can add new classes to the system.

The system is extended by running Smalltalk code that creates or defines classes and methods.

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In this way a Smalltalk system is a "living" system, carrying around the ability to extend itself at run time. Since the classes are objects, they can be asked questions such as "what methods do you implement? So objects can easily be inspected, copied, de serialized and so on with generic code that applies to any object in the system. Smalltalk also provides computational reflection, the ability to observe the computational state of the system.

In languages derived from the original Smalltalk the current activation of a method is accessible as an object named via a pseudo-variable one of the six reserved words , thisContext. By sending messages to thisContext a method activation can ask questions like "who sent this message to me". These facilities make it possible to implement co-routines or Prolog -like back-tracking without modifying the virtual machine. The exception system is implemented using this facility. One of the more interesting uses of this is in the Seaside web framework which relieves the programmer of dealing with the complexity of a Web Browser's back button by storing continuations for each edited page and switching between them as the user navigates a web site.


Smalltalk-80, The Interactive Programming Environment

Programming the web server using Seaside can then be done using a more conventional programming style. An example of how Smalltalk can use reflection is the mechanism for handling errors. When an object is sent a message that it does not implement, the virtual machine sends the object the doesNotUnderstand: message with a reification of the message as an argument. The message another object, an instance of Message contains the selector of the message and an Array of its arguments.

In an interactive Smalltalk system the default implementation of doesNotUnderstand: is one that opens an error window a Notifier reporting the error to the user. Through this and the reflective facilities the user can examine the context in which the error occurred, redefine the offending code, and continue, all within the system, using Smalltalk's reflective facilities.

By creating a class that understands implements only doesNotUnderstand:, one can create an instance that can intercept any message sent to it via its doesNotUnderstand: method. Such instances are called transparent proxies.

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Smalltalk syntax is rather minimalist, based on only a handful of declarations and reserved words. In fact, only six "keywords" are reserved in Smalltalk: true , false , nil , self , super , and thisContext. These are properly termed pseudo-variables , identifiers that follow the rules for variable identifiers but denote bindings that a programmer cannot change. The true , false , and nil pseudo-variables are singleton instances. The only built-in language constructs are message sends, assignment, method return and literal syntax for some objects. From its origins as a language for children of all ages, standard Smalltalk syntax uses punctuation in a manner more like English than mainstream coding languages.

The remainder of the language, including control structures for conditional evaluation and iteration, is implemented on top of the built-in constructs by the standard Smalltalk class library. For performance reasons, implementations may recognize and treat as special some of those messages; however, this is only an optimization and is not hardwired into the language syntax.

The adage that "Smalltalk syntax fits on a postcard " refers to a code snippet by Ralph Johnson , demonstrating all the basic standard syntactic elements of methods: [27]. The following examples illustrate the most common objects which can be written as literal values in Smalltalk methods. The last two entries are a binary and a hexadecimal number, respectively. The number before the 'r' is the radix or base. Two equal strings strings are equal if they contain all the same characters can be different objects residing in different places in memory.

In addition to strings, Smalltalk has a class of character sequence objects called Symbol.