Design Patterns And Design Principles Notes

Here are my design pattern notes in summary that I’ve already extracted. The order may be mixed, but I noted the important points and concepts.

Design pattern is a general repeatable solution to commonly occurring problem in software design.

• Creational patterns deal with the process of object creation
• Structural patterns, deal primarily with the static composition and structure of classes and objects
• Behavioral patterns, which deal primarily with dynamic interaction among classes and objects

A pattern has four essential elements (GoF)

• Pattern name: increases vocabulary of designers.
• Problem: intent, context, when to apply.
• Solution: UML-like structure, abstract code.
• Consequences: results and tradeoffs.

Name

• Describes the pattern
• Adds to common terminology for facilitating communication (i.e. not just sentence enhancers)

Problem

• Describes when to apply the pattern
• Answers — What is the pattern trying to solve?

Solution

• Describes elements, relationships…