Composition with children in React
React interview exercise on Components & JSX, 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 Card: <section className="card"> with the `title` prop in an <h2>, the children inside <div className="body">, and, only when a `footer` prop is given, a <footer> holding it.
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.