Vue Answers

When to use setup() hook of Vue Composition API?

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The setup() hook in Vue Composition API is where you define component logic, including data, computed properties, methods, and lifecycle hooks. It replaces the options object (data, computed, methods, etc.) used in Vue 2’s Options API.

Here’s when you should use the setup() hook:

1. Functional Components

When creating functional components using the Composition API, you must use the setup() hook because functional components do not support options objects.

2. Reusable Logic with Composition Functions

If you have reusable logic that you want to share across multiple components, you can encapsulate that logic in a composition function and call it within the setup() hook of your components.

3. Access to Lifecycle Hooks

You can access Vue’s lifecycle hooks (created, mounted, etc.) within the setup() hook. This allows you to define lifecycle logic for your component.

4. Reactive Data and Computed Properties

You can define reactive data using ref() or reactive() and computed properties using computed() within the setup() hook. This provides a more flexible and composable way to define reactive data and computed properties compared to the Options API.

5. Access to Component Context

Inside the setup() hook, you have access to the component’s context via the context argument. This includes properties like props, attrs, slots, emit, and refs.

6. Cleaner Code Structure

The Composition API allows you to organize your component logic more cohesively and logically, making it easier to understand and maintain complex components.

Overall, the setup() hook provides a more flexible and powerful way to define component logic compared to the Options API, especially for complex components or when using functional components.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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