Rust Interview Questions
Test your Rust programming knowledge with questions on ownership, borrowing, lifetimes, traits, async programming, and memory safety.
Frequently Asked Questions
What Rust concepts are most important for interviews?
Ownership and borrowing rules, lifetimes, traits and generics, error handling (Result/Option), pattern matching, closures, iterators, and smart pointers (Box, Rc, Arc). For systems roles, also know unsafe Rust, FFI, and concurrency primitives (Mutex, channels).
Is Rust used enough to appear in interviews?
Yes, increasingly. Companies like Amazon, Google, Microsoft, Cloudflare, and Discord use Rust. It's especially relevant for systems programming, infrastructure, WebAssembly, and performance-critical applications. Rust skills are in high demand with limited supply.
How does Rust's ownership system prevent bugs?
Ownership ensures each value has exactly one owner, borrowing rules prevent data races at compile time, and lifetimes guarantee references are always valid. This eliminates null pointer dereferences, use-after-free, double-free, and data race bugs without needing a garbage collector.
What is the difference between Box, Rc, and Arc?
Box provides heap allocation with single ownership. Rc (Reference Counted) allows multiple owners in single-threaded code. Arc (Atomic Reference Counted) allows multiple owners across threads safely. Use Box for heap data, Rc for shared ownership in single-threaded code, and Arc for multi-threaded sharing.
How does async/await work in Rust?
Rust's async functions return Futures that must be polled by an async runtime (like Tokio or async-std). Futures are zero-cost abstractions compiled to state machines. Rust's async model is different from Go's goroutines or JavaScript's event loop - it requires explicit runtime selection and is more verbose but more efficient.
What are common Rust interview coding challenges?
Expect problems involving ownership transfer, lifetime annotations, implementing traits, using iterators and closures, error handling with Result chains, and concurrent data processing with Arc and Mutex. String manipulation problems are common since Rust strings have unique ownership semantics.