v-model on a component in Vue
Vue interview exercise on Props & events, 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 QuantityInput usable with v-model: props `modelValue` (number, required), `min` (default 1) and `max` (default 99); <button class="dec">, an <input> showing the value, <button class="inc">. The buttons emit `update:modelValue` with the value ±1, staying within min and max (at the limit, emit nothing). Typing a whole number into the input emits it clamped to the range; typing something that is not a number emits nothing.
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.