Vue Interview Prep - Programming

Vue 3 wraps reactive objects in JavaScript proxies that intercept property reads and writes. When a component renders, Vue records which properties it reads as dependencies. When a property changes, the proxy notifies Vue, which re-runs the affected rendering. This automatic dependency tracking keeps the view in sync without manual updates.

The Composition API shines in larger components where related logic would otherwise be scattered across options, and when you want to extract reusable logic into composables. The Options API is simpler and readable for small components. Many teams adopt the Composition API for consistency and better TypeScript support.

v-if conditionally renders an element, adding or removing it from the DOM, so it has higher toggle cost but no rendering when false. v-show keeps the element in the DOM and toggles display via CSS, cheaper for frequent toggles. Choose based on how often the condition changes.

For a few levels, pass props down. To avoid prop drilling through many layers, use provide in an ancestor and inject in a descendant to share values directly. For truly global state a store like Pinia is appropriate. Choosing the right mechanism keeps data flow understandable.

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