Explain Reactive Data in Vue.js

Instruction: Describe how Vue.js achieves reactivity and the importance of reactive data in Vue.js applications.

Context: This question aims to assess the candidate's understanding of Vue.js's reactivity system and its significance in automatically updating the UI based on state changes.

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Specify the Vue version. Vue 2 primarily used Object.defineProperty-based observation with limitations around adding properties and array index changes. Vue 3 uses proxies for reactive objects and tracked value access for refs. Presenting the Vue 2 mechanism as the universal current implementation is misleading.

Reactive reads establish dependencies for an active effect such as a component render; relevant writes can trigger that effect...

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