Stoop 430-design patternsintro
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This document provides an introduction to design patterns, explaining that patterns are reusable solutions to common problems in software design. It describes the key elements of patterns, including their names, contexts for application, solutions, consequences, and benefits such as improved reuse and education. The document also categorizes common patterns into creational, structural, and behavioral groups and provides examples. It cautions that patterns should not be overused and that their implementation can vary.
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The document describes brush hierarchies and attributes for canvas and tags in HTML. It defines hierarchies for canvas, brushes and tags. It lists the factory selector, brush class and attribute accessors for various tag brushes. This includes div, fieldset, form inputs, buttons, tables and other tags. It provides the classes and methods to represent and manipulate these elements when building HTML documents.
99 questions
This document provides an overview of the key concepts in the Smalltalk programming language. It discusses how Smalltalk is a fully reflective, dynamic object-oriented programming environment. Smalltalk uses a simple uniform object model that allows for live, dynamic and interactive software development. The document outlines various Smalltalk basics like syntax, standard classes, coding idioms, debugging practices, design patterns and more. It also covers advanced topics like reflection and how the Smalltalk meta-model is reified through reflection.
13 traits
This document provides an overview of traits in programming. It discusses the limitations of single and multiple inheritance, as well as mixins. Traits are introduced as a way to share behavior across class hierarchies without these issues. Key points about traits are that they provide methods but no state, and classes have full control over trait composition. The document also presents a case study on refactoring stream classes using traits for improved reuse and design. It concludes with discussion on the implementation of traits in Pharo and potential future directions.
12 virtualmachine
This document discusses virtual machines and their implementation. It begins with an introduction to virtual machines, noting that they provide an abstract computing architecture that supports programming languages in a hardware-independent way. It then outlines the main components of a virtual machine, including the heap store, interpreter, automatic memory management, and threading system. The document dives into more detail on each of these components and also discusses optimizations that can be performed. It concludes by noting that while virtual machines provide benefits like platform independence, there is an overhead to their execution.
11 bytecode
This document provides an overview of working with bytecode in Pharo. It discusses:
- The Pharo compiler and how it translates code to an abstract syntax tree (AST), intermediate representation (IR), and finally bytecode.
- Generating bytecode using the IRBuilder tool, which allows defining bytecode instructions like stack operations, jumps, sends, and accessing variables.
- Parsing and interpreting bytecode using the InstructionStream hierarchy, which allows analyzing, printing, and decompiling bytecode.
10 reflection
Reflection allows programs to examine and modify their own structure and behavior at runtime. The document discusses introspection, which allows observing an object's state, and intercession, which enables modifying execution state. It covers reification, representing runtime concepts as objects, and how this enables metaprogramming to manipulate a running system. Key topics are reflective capabilities in various languages, structural versus behavioral reflection, and how reflection is implemented using metaobjects and metaclasses.
08 refactoring
This document provides an overview of refactoring and design patterns. It begins with some principles of object-oriented design like the open-closed principle. It then defines refactoring as changing code without altering external behavior to improve structure. Common code smells that indicate needs for refactoring are described, like duplicated code. The document outlines the Law of Demeter and provides examples of violations. It concludes by introducing design patterns and focusing on the singleton pattern.
06 debugging
The document provides guidance on debugging in Smalltalk. It discusses common syntactic, semantic, and encapsulation errors. It also covers debugging patterns such as using print statements, tests, inspectors, breakpoints, and debuggers to debug code. The document emphasizes that the debugger, inspector, browser, and message name finder are useful debugging tools and that tests are important to prevent regressions when debugging. It also notes some best practices like avoiding modifying collections during iteration, using accessors to encapsulate state, and not referencing class names directly.
04 idioms
This document discusses Smalltalk coding idioms and best practices. It covers topics like:
- Using cascades and the "yourself" message to chain messages to the same receiver.
- Distributing responsibilities across many small, carefully named methods to promote reuse and maintainability.
- Techniques for initializing objects, establishing class invariants, and representing instance creation.
- Debugging techniques like printing an object's state.
The document provides code examples and explanations for common patterns in Smalltalk, such as initializing instance variables, creating collection objects, and defining constructor and accessor methods. It is intended as a guide for writing well-structured and maintainable Smalltalk code.
03 standardclasses
The document discusses Smalltalk standard classes. It covers the Object class which defines common behavior for all objects. Number classes are described, including automatic coercion between types. Strings and arrays are also covered, including literal and regular array creation. Variable types like global, instance, and block variables are explained. Control structures are implemented through message passing and blocks. Various collection classes are introduced at the end.
02 basics
Smalltalk is an object-oriented programming language where everything is an object and communication is done through message passing. The document discusses Smalltalk basics including its syntax, variables, methods, blocks, control structures and more. It provides a roadmap for learning Smalltalk and examples to illustrate Smalltalk concepts.
01 intro
This document provides an introduction to the Smalltalk programming language and environment. It outlines the course schedule and goals, which include learning about Smalltalk's history and object-oriented model, as well as concepts like classes, metaclasses, reflection, and advanced design patterns. The document discusses Smalltalk's origins at Xerox PARC and the key ideas it was influenced by. It also describes Smalltalk's pure object model where everything is an object that communicates through message passing. Finally, it provides an overview of the Smalltalk development environment and tools like the browser, debugger, and inspector.
Stoop sed-class initialization
The document discusses class initialization in object-oriented programming. It explains that class initialization is used to initialize class variables and instance variables when a class is loaded. The class initialization method, which in Squeak is named 'initialize', is automatically called by the system at load time or can be explicitly called by the programmer. It provides an example of a Date class initialization method that initializes various class variables with data like month names and numbers of days in each month.
Stoop sed-class initialization
The document discusses class initialization in object-oriented programming. It explains that class initialization is used to initialize class variables and instance variables when a class is loaded. The class initialization method, typically named "initialize", is automatically called by the system and can be used to set up default values for properties that are shared across all class instances. The document provides an example Date class that defines various class variables for storing things like month names and days in a month, and initializes these values in its Date class>>initialize method.
Stoop metaclasses
The document discusses metaclasses in Smalltalk. Some key points:
1. Every class is an instance of a metaclass. The metaclass hierarchy parallels the class hierarchy.
2. Metaclasses inherit from Class and Behavior. Every metaclass is an instance of Metaclass.
3. The metaclass of Metaclass is also an instance of Metaclass, completing the metaclass hierarchy.
Stoop ed-subtyping subclassing
This document discusses the differences between subclassing and subtyping in object-oriented design. It explains that subclassing is using inheritance primarily for code reuse, even if the subclass interface is not compatible with the superclass interface. Subtyping uses inheritance to reuse interface specifications so that subclasses are substitutable for their superclasses. The document recommends favoring subtyping over subclassing for reusable software since it leads to more understandable class relationships based on interfaces rather than implementation.
Stoop ed-lod
The document discusses coupling and the Law of Demeter principle, which states that objects should only communicate with their immediate neighbors. Following this principle leads to code with looser coupling, better encapsulation, and easier substitution of components. The document provides examples of correct and incorrect ways to follow the Law of Demeter when sending messages to instance variables, arguments, self, and newly created objects. It also discusses some exceptions like collections, as well as considerations around using accessors instead of direct instance variable access. Overall it emphasizes designing objects with complete interfaces that protect encapsulation.
Stoop ed-class forreuse
This document discusses principles of object-oriented design, including:
1. Parametrizing code to avoid hardcoding constants and allow runtime changes without recompilation.
2. Defining behavior independently of state through abstract state and message layers.
3. Dividing programs into short, single-purpose methods to improve readability, reuse, and maintenance.
Stoop 450-s unit
Unit testing involves writing small tests for individual units or classes of code to ensure specified behaviors are maintained. Tests should be written incrementally and even before code is written. When bugs are discovered, write tests to demonstrate the bug before fixing. Tests act as documentation and provide confidence when refactoring code. Common unit testing frameworks like SUnit and JUnit provide tools for writing, running, and collecting test results. Tests should be repeatable, require no human intervention, and change less often than the code being tested.
Stoop 440-adaptor
The document discusses the adapter design pattern, which allows classes with incompatible interfaces to work together. The adapter pattern involves a target interface that clients expect, an adaptee with a different interface that needs adapting, and an adapter class that converts the adaptee's interface to the target interface. The adapter acts as a bridge between the adaptee and target, allowing the adaptee's functionality to be accessed by clients through the target interface.
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Stoop 430-design patternsintro
- 1. An Introduction to Design Patterns
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