Design pattern
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The document discusses design patterns and provides examples of the observer pattern and singleton pattern. It notes that there are around 50 known design patterns that can be leveraged to solve common problems without needing to reinvent solutions. As an example, it explains how the observer pattern is used in applications like Google Alerts and RSS feeds to automatically notify subscribers when updates occur.
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Design pattern
- 1. Design Pattern D ESIGN P ATTERN
- 2. Design Pattern Outline What is ? Why Design Pattern? Pattern In Action Observer Pattern SingleTon Pattern Classification Feedback
- 3. Design Pattern What is DP General * Reusable * solution to Commonly Occurring problem (Experience Reuse Rather Code Reuse) Description or Template for how to Solve A * Common Problem *
- 4. Design Pattern Learn DP There are around 50(!)s of DPs Already done for you. So, We Won’t ** REINVENT THE WHEEL **
- 5. Design Pattern DP There are around 50(!)s of DPs Already done for you. So, We Won’t ** REINVENT THE WHEEL **
- 6. Design Pattern Pattern In action Google Alert / RSS Feed What Happens?
- 7. Design Pattern Pattern In action Google Alert / RSS Feed What Happens? 1. New user can subscribe any time
- 13. Design Pattern Pattern In action Solution is The OBSERVER PATTERN