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Rust
match with Guards, Ranges, and Bindings
`match` arms can have `if` guards, range patterns (`1..=5`), bindings (`x @ pattern`), and ORs (`A | B`). Combine them for very expressive dispatch.
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Java
Pattern Matching for instanceof (Java 16+)
Combine `instanceof` with a variable binding — no separate cast needed. Eliminates the most common "check then cast" bug pattern and is significantly less verbose.
Java
Sealed Classes + Pattern Matching (Java 21+)
`sealed` restricts which classes can extend a type — perfect for closed hierarchies that pattern matching can switch over exhaustively. The compiler enforces that you handle every variant.