A first composable in Vue
Vue interview exercise on Composables, 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 useCounter(initial = 0, { min = 0, max = Infinity } = {}) returning { count, increment, decrement, reset, isMin, isMax }: count is a ref kept within min…max, isMin and isMax are computed booleans, reset returns to the initial value.
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.