Render functions in Vue
Vue interview exercise on Slots & dynamic components, difficulty 2 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 two components with render functions. Heading with a prop `level` (1–6, default 2; anything outside is clamped) renders an <h{level} class="heading"> with its default slot. Stack with a prop `gap` (default 1) renders a <div class="stack gap-{gap}"> with its default slot's content.
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.