Скачать или смотреть Scala tailrec Annotation: Write Stack-Safe Recursive Functions

Tail-call optimization in Scala allows recursive functions to reuse stack frames, preventing stack overflow errors. A tail call occurs when a function’s last operation is a recursive call. Use the tailrec annotation to enforce TCO at compile time. This is critical for deep recursion in functional programming, like traversing large data structures or iterative algorithms. Unlike regular recursion, tail-recursive methods accumulate results in parameters rather than stacking intermediate values. Always structure recursive logic so the final step is only the recursive call. TCO works with direct tail recursion but not mutual recursion. Let’s see a code example!
This example compares unsafe recursion with tail-recursive methods using tailrec. It implements factorial and list-sum functions, demonstrating how accumulators enable TCO. The annotations ensure compile-time checks. Outputs validate both approaches but highlight TCO’s necessity for scalability.

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