An error boundary with onErrorCaptured in Vue
Vue interview exercise on Patterns, difficulty 3 of 3. Solve it in the editor beside a worked example, or cold in Interview mode with the example hidden; the tests run the moment you do.
Write ErrorBoundary: it renders its default slot normally; when a descendant throws, it captures the error (and stops it propagating), replacing the content with <p class="error"> holding the error's message and a <button class="retry"> that clears the error so the slot renders again.
Each exercise pairs a worked example with a twin problem to solve in a real editor; the tests run the moment you do. Interview mode hides the example: solve it from memory, without the hint or the solution, and it counts as solved cold. Progress is saved in your browser, and in your account if you sign in.