Vue 3 vs Vue 2

Vue 3 is the latest major version of the Vue.js framework. While Vue 2 is still widely used, Vue 3 introduces several important improvements in performance, TypeScript support, and new APIs like the Composition API.

Key Differences

• Composition API: Vue 3 introduces a new way to organize component logic using the Composition API.
• Performance: Vue 3 is faster and smaller due to a rewritten Virtual DOM and tree-shaking support.
• Fragment Support: Vue 3 allows multiple root nodes in a component.
• Teleport: A new built-in feature to render content outside the parent component.
• Better TypeScript Integration: Vue 3 is built with TypeScript support in mind.
• Reactivity System: Vue 3 uses Proxies for more efficient reactivity, replacing Object.defineProperty from Vue 2.

Vue 2 Example

A simple counter in Vue 2:

Vue 3 Example (Composition API)

Same counter rewritten using Vue 3 Composition API:

Other Notable Improvements

• Support for multiple root elements in templates.
• New v-model syntax with argument support.
• Improved slot syntax and scoped slots.
• Better tree-shaking and smaller bundle sizes.
• New built-in Suspense component for async components.

Conclusion

Vue 3 modernizes the framework and improves performance and maintainability. While Vue 2 remains widely used, new projects should start with Vue 3 to take advantage of the new features.