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How does Rust ensure memory safety without a garbage collector?

Asked on Dec 07, 2025

Answer

Rust ensures memory safety without a garbage collector through its ownership model, which enforces strict rules at compile time to manage memory. The Rust compiler uses the borrow checker to verify that references do not outlive the data they point to, preventing data races and ensuring safe memory access.

Example Concept: Rust's ownership model is based on three core principles: each value in Rust has a single owner, a value can only have one mutable reference or multiple immutable references at a time, and when the owner goes out of scope, the value is automatically deallocated. The borrow checker enforces these rules to ensure that references are valid and memory is accessed safely, eliminating the need for a garbage collector.

Additional Comment:
  • Rust's ownership model helps in achieving zero-cost abstractions, making programs both safe and performant.
  • By enforcing these rules at compile time, Rust avoids runtime overhead associated with garbage collection.
  • The borrow checker is a key component that ensures references do not lead to dangling pointers or data races.
  • Rust's approach allows developers to write concurrent code safely without fear of memory corruption.
✅ Answered with Programming Language best practices.

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