What is the Vue 3 setup function?

Can you explain what the setup function in Vue 3 is?

The setup function is a new feature in Vue 3 that allows you to organize your component's logic more effectively. It runs before the component is created and is used to declare reactive state, computed properties, and methods.

How does it differ from the data and methods options?

Unlike the data and methods options, which are part of the options API, the setup function is part of the composition API. It allows for better organization and reusability of code by enabling you to group related logic together.

Can you give me a simple example of using the setup function?

Sure! Here's a basic example:

import { ref } from 'vue';

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

This creates a reactive count variable and an increment method.

What are the benefits of using the setup function?

The setup function promotes better code organization, enhances reusability, and makes it easier to manage complex components by allowing you to use reactive state and lifecycle hooks in a more flexible way.