Design Patterns in Scala
summary
Compares classic patterns to concrete Scala constructs and tradeoffs: companion object apply replaces static factory methods, lazy modifier gives thread-safe deferred init, and object implements singletons with on‑demand init. Shows adapters as implicit classes, decorators via traits with abstract override, case classes for value objects, Option instead of null objects, by‑name parameters for Command, partial functions + orElse for Chain, and self types for dependency injection; notes Java interop and pros/cons (conciseness, static checks, some loss of control).
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chapters (11)
- 0:00Introduction
- 2:39Factory method
- 6:14Lazy initialization
- 9:13Singleton
- 12:00Adapter
- 14:11Decorator
- 18:34Object
- 22:25Null Object
- 25:32Strategy
- 30:53Chain of Responsibility
- 33:56Dependency Injection
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