Types: Weak/Duck/Optional vs Strong/Strict (RU)

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Compares concrete behaviors: JavaScript implements ad‑hoc coercions and lets a permutations function run without compile errors, Java compiles the same algorithm but demands many explicit types and is verbose with streams, Scala infers most types via Hindley‑Milner type inference so code stays concise, and languages like Haskell/Idris support dependent types verify properties so the compiler can prove list lengths or factorial‑size outputs at compile time rather than rely on tests.

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1. 0:00Introduction
2. 10:56Formal type systems
3. 27:31Typing mathematical basis
4. 33:21Language comparisons
5. 41:21Dependent types future
6. 48:53Q&A