Design Pattern Overview

         1. What is a Design Pattern?

ð  In software development , a pattern (or design pattern) is a written document that describes a general solution to design problem that recurs repeatedly in many project

ð  Pattern in programming are like recipes in cooking. They are not ready dishes, but instructions for slicing and dicing products, cooking them, serving them and so forth

ð  It have certain rules and regulation

Examples:

#1 – Consider below tiles picture

These tiles are arranged in a pattern

#2 – There is a pattern in these numbers: 2, 7, 12, 17, 22, … they follow a rule “start at 2 and add 5 each time”.

          2. Why should we learn patterns?

         The most important reason is that pattern simplify the design and support of programs

¨       Tried and tested solutions

You spend less time by applying ready solutions instead of re-inventing the bicycle.

¨       Code unification

You create fewer bugs, since you use typical unified solutions where all hidden bugs have already been discovered.

¨       Universal programmers vocabulary

You simply pronounce the name of a pattern instead of spending an hour explaining to other programmers the benefits of your new design pattern and listing the required classes.

          3. Type of design patterns?

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