Two-way binding with model() in Angular
Angular interview exercise on Inputs & outputs, difficulty 2 of 3. Solve it in the editor beside a worked example; the tests run the moment you do.
QuantityComponent has a `quantity` model (default 1) and `min` and `max` inputs (1 and 10). The minus and plus buttons move the quantity by one and are disabled at the bounds; the <output> shows it. The parent must be able to write [(quantity)]="amount".
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