Start by clarifying the requirements and constraints, then outline a solution using useEffect with a cleanup function to handle strict mode. Emphasize the importance of idempotent effects and demonstrate how to ensure the animation runs once by using a ref or proper cleanup.
Pro tip: Use a ref to track whether the animation has already started, and always clear the timer in the cleanup function to prevent memory leaks and duplicate animations. This shows you understand React's lifecycle and strict mode nuances.
Restate the problem to ensure you understand the need for a typewriter effect that runs once, even in strict mode. Ask about edge cases like component unmounting or prop changes.
Plan to use useEffect with an empty dependency array to run once on mount. Use a ref to guard against double invocation in strict mode, and set up a timer with setInterval or setTimeout.
Return a cleanup function from useEffect that clears the timer. This prevents memory leaks and ensures that if the component unmounts, the animation stops.
Explain that in strict mode, effects run twice (mount, unmount, mount). Use a ref to track if the animation has already started, so the second mount doesn't restart it.
Mention testing the component in strict mode to verify the animation runs only once. Discuss potential pitfalls like stale closures and how to avoid them.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.