Join Jungwoo Ryoo for an in-depth discussion in this video Strategy, part of Python: Design Patterns.
- The Strategy pattern offers a family of…interchangeable algorithms to a client.…The problem we often see is that there is a need…for dynamically changing the behavior of an object.…So we offer our Strategy class with its default behavior.…When there is a need, we provide another variation…of the Strategy class by dynamically replacing…its default method with a new one.…
Python allows adding methods dynamically…by importing the types module.…
Author
Jungwoo Ryoo
Released
7/16/2015- Understanding design patterns
- Best design practices: consistency, completeness, and correctness
- Working with creational patterns
- Working with structural patterns
- Working with behavioral patterns
Skill Level Intermediate
Duration
Views
Q: In the strategy pattern example, why does the code keep executing the default function rather than the alternate?
A: The programming demonstration skips the step of defining what the strategy pattern should be when an alternate function name is provided
as an argument as shown below.
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Introduction
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Welcome34s
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1. Understanding Design Patterns
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What is a design pattern?2m 18s
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Types of design patterns1m 47s
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2. Creational Patterns
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Factory48s
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Factory example6m 44s
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Abstract factory1m 24s
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Abstract factory example5m 23s
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Singleton57s
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Singleton example5m 32s
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Builder1m 44s
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Builder example4m 34s
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Prototype58s
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Prototype example6m 2s
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3. Structural Patterns
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Decorator51s
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Decorator example4m 23s
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Proxy1m 7s
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Proxy example5m 19s
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Adapter37s
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Adapter example5m 54s
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Composite1m 14s
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Composite example4m 56s
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Bridge1m 12s
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Bridge example4m 46s
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4. Behavioral Patterns
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Observer1m 1s
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Observer example7m 27s
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Visitor48s
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Visitor example6m 59s
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Iterator1m 9s
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Iterator example4m 10s
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Strategy37s
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Strategy example6m 1s
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5. Design Best Practices
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Consistency2m 18s
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Other qualities2m 42s
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Conclusion
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Next steps28s
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Video: Strategy