How do SOLID principles differ in dynamically-typed vs statically-typed languages?

SOLID principles are language-agnostic in intent but their implementation differs significantly based on type system. In statically-typed languages (Java, C#, TypeScript), SOLID is enforced at compile time: interfaces are explicit types, DIP is implemented via type annotations, and LSP violations can be caught by the type checker. In dynamically-typed languages (Python, Ruby, JavaScript), there are no compile-time interface checks. DIP is implemented via duck typing — any object with the right methods works. LSP violations only manifest at runtime. OCP is achieved through monkey patching (risky) or proper extension classes. ISP is less formally enforced — you rely on convention and documentation. The SOLID intent (single responsibility, extensibility, substitutability) is still valuable, but the enforcement mechanisms are testing, code review, and conventions like Python's Protocol type hints, rather than compiler checks. Dynamically-typed languages often achieve DIP through framework conventions (Ruby on Rails, Django) rather than explicit DI containers.