What is Vue.js reactivity and how does it work?

What is Vue.js reactivity and how does it work?

Vue.js reactivity is a system that allows Vue to automatically update the DOM when the underlying data changes. It uses a dependency tracking mechanism to observe changes in data.

Can you explain how Vue tracks changes in data?

Vue uses getters and setters to intercept data access and modification. When a component accesses a reactive property, Vue records that dependency, so it knows which components to re-render when the data changes.

What are the benefits of using Vue's reactivity system?

The main benefits include automatic DOM updates, improved performance through efficient re-rendering, and a more intuitive way to manage state in applications.

Are there any limitations to Vue's reactivity?

Yes, Vue's reactivity has some limitations, such as not detecting property additions or deletions on reactive objects unless they are explicitly made reactive.

How does Vue 3 improve upon the reactivity system compared to Vue 2?

Vue 3 introduces a new reactivity system based on Proxies, which allows for better performance and more flexibility in handling reactivity.