Rust Lifetimes: Core Vocabulary
Deepen your understanding of Rust's lifetime system — lifetime annotation syntax, the three elision rules, the 'static lifetime, how NLL improved the borrow checker, and lifetime subtyping constraints.
'a tell the Rust compiler?fn longest<'a>(x: &'a str, y: &'a str) -> &'a str, 'a tells the compiler the returned reference lives no longer than the shorter of x or y, enabling the borrow checker to reject dangling references.Frequently Asked Questions
What does the "Rust Lifetimes: Core Vocabulary" vocabulary exercise cover?
This exercise tests real IT vocabulary related to rust lifetimes: core vocabulary through 5 multiple-choice questions, each built from realistic workplace sentences rather than abstract definitions.
Is this vocabulary exercise free to use?
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How many questions does this exercise have?
This exercise has 5 questions. Each one shows a real-world sentence or scenario with multiple-choice options and an explanation once you answer.
What happens after I answer a question?
You'll see immediate feedback showing whether your answer was correct, along with a short explanation of why — then a button to move to the next question, and a full results screen at the end.
Can I retry the exercise if I get questions wrong?
Yes. Once you reach the results screen, click "Try again" to reset your answers and go through the exercise from the start as many times as you like.
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No account is needed. Your answers are scored in your browser during the session — nothing is saved to a server, so you can jump straight in.
Is my progress saved if I leave the page?
No — progress within an exercise resets if you navigate away or reload. Each exercise is short enough to complete in a few minutes in one sitting.
Are these vocabulary exercises connected to other topics?
Yes — browse the full vocabulary exercises hub to find related modules covering adjacent IT topics and roles.
How is this different from reading a glossary or blog article?
Exercises like this one are active recall drills — you have to choose the correct term or phrasing yourself, which builds retention faster than passively reading a definition.
Where can I find more vocabulary exercises?
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