What are the differences between Vue's setup function and options API?

What are the differences between Vue's setup function and options API?

The setup function is part of the Composition API introduced in Vue 3, allowing for a more flexible and organized way to manage state and logic. The Options API, on the other hand, is the traditional way of defining components using data, methods, and lifecycle hooks.

Can you give me an example of how to use the setup function?

Sure! In the setup function, you can define reactive state using ref or reactive. For example:

import { ref } from 'vue';

export default {
  setup() {
    const count = ref(0);
    const increment = () => count.value++;
    return { count, increment };
  }
};

What are the benefits of using the setup function?

The setup function promotes better code organization, reusability of logic through composables, and improved TypeScript support. It also allows for a more functional approach to component design.

Is the Options API still relevant?

Yes, the Options API is still relevant and widely used, especially in existing projects. It can be easier for beginners to understand and is supported in Vue 3 alongside the Composition API.