useAsync in Vue
Vue interview exercise on Composables, 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 useAsync<T>(task: (...args) => Promise<T>) returning { data, error, loading, execute }: execute(...args) sets loading, runs the task and stores the result in data (or the error's message in error, clearing the other), then clears loading. If execute is called again before the previous run finished, the older result is ignored: only the latest call may write.
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.