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copied!<p>They are not absolutely needed, but the good definitely outweighs the bad. </p> <p><strong>The good:</strong></p> <ol> <li><strong>Code readability:</strong> They do help you write more understandable code with better names for what you are trying to accomplish. <ul> <li><strong>Code maintainability:</strong> Allows your code to be maintained easier because it is more understandable. </li> <li><strong>Communication:</strong> They help you communicate design goals amongst programmers.</li> <li><strong>Intention:</strong> They show the intent of your code instantly to someone learning the code. </li> <li><strong>Code re-use:</strong> They help you identify common solutions to common problems.</li> <li><strong>Less code:</strong> They allow you to write less code because more of your code can derive common functionality from common base classes.</li> <li><strong>Tested and sound solutions:</strong> Most of the design patterns are tested, proven and sound.</li> </ul></li> </ol> <hr> <p><strong>The bad:</strong></p> <ol> <li><strong>Extra levels of indirection:</strong> They provide an extra level of indirection and hence make the code a little more complex. <ul> <li><strong>Knowing when to use them:</strong> They are often abused and used in cases that they should not be. A simple task may not need the extra work of being solved using a design pattern.</li> <li><strong>Different interpretations:</strong> People sometimes have slightly different interpretations of design patterns. Example MVC as seen by django vs. MVC as seen by Ruby on Rails. </li> <li><strong>Singleton:</strong> Need I say more?</li> </ul></li> </ol>

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