Named slots and fallbacks in Vue
Vue interview exercise on Slots & dynamic components, difficulty 1 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 Card: an <article class="card"> with a <header> holding the `header` slot (fallback text "Untitled"), a <div class="body"> holding the default slot, and a <footer> holding the `footer` slot, rendered only when a footer was given ($slots).
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.