Design Patterns in Dynamic and Functional Languages
summary
Claims that many GoF patterns either disappear or change implementation in modern languages, with concrete examples: closures replace Command (Groovy/Ruby blocks used instead of command objects), iterators are built into Groovy/Ruby, builders use method_missing DSLs (recipe DSL via Integer metaclass), adapter solved by runtime interface switching in Ruby, decorator implemented with modules, memoize functions (built-in) give orders-of-magnitude speedups, and lazy sequences produce infinite collections and efficient pipelines (Clojure/Scala/Java 8).
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chapters (18)
- 0:00Introduction to modern patterns
- 2:25Iterator pattern in modern languages
- 4:11Command pattern with closures
- 6:21Strategy pattern simplified
- 8:12Builder pattern with method missing
- 11:02Template method flexibility
- 14:40Interpreter pattern and DSLs
- 22:28Factory pattern edge cases
- 24:36Decorator pattern in Ruby
- 29:55Adapter pattern with open classes
- 34:56Null object pattern in Ruby
- 37:46Functional programming patterns
- 41:36Filter map and reduce in Java
- 45:32Flatten and flatMap explained
- 49:07Closures and state management
- 51:55Memoization and caching
- 53:42Laziness in functional languages
- 55:27Summary and future insights
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