Introduction

In this article we will learn about design patterns in Smalltalk MVC. The patterns described are observer, composite and strategy patterns.   The Model/View/Controller set of classes are used to build user interfaces in Smalltalk-80. MVC consists of three kinds of objects.   Model is the application object. View is the representation of the model […]

In this article we will learn various reasons that will describe what is the use of design patterns for solving problems.   Before knowing the use of design patterns, have a look at need for design patterns.   Following are some of the uses of design patterns: Make it easier to reuse successful designs and […]

In this article we will learn various reasons that will describe what is the need for design patterns for solving problems.   Design of object oriented software is hard: People who are familiar with object oriented software development are familiar with the fact that designing reusable object oriented software is very hard. So, what will […]

In this article we will learn about what is a design pattern. In particular we will learn the definition of  a design pattern and its essential elements.   According to Christopher Alexander, “Each pattern describes a problem which occurs over and over again in our environment, and then describes the core of the solution to […]