Integrating Vuex in Nuxt.js

1. Introduction

Goal of the Tutorial

This tutorial aims to guide you on how to integrate Vuex into a Nuxt.js project. Vuex is a state management library for Vue.js applications. It serves as a centralized store for all the components in an application.

Learning Outcomes

By the end of this tutorial, you will be able to:
- Understand the process of integrating Vuex into a Nuxt.js application.
- Set up and configure Vuex in a Nuxt.js project.
- Use Vuex to manage the state in a Nuxt.js application.

Prerequisites

This tutorial assumes that you have the basic understanding of JavaScript, Vue.js, and Nuxt.js. Familiarity with ES6 syntax is also beneficial.

2. Step-by-Step Guide

Concepts

Vuex is a state management pattern + library for Vue.js applications. It allows you to centralize your application's state and logic. Nuxt.js projects come with Vuex by default.

Vuex Store

In Nuxt.js, each .vue file inside the store directory is transformed as a namespaced module (index being the root module).

Best Practices and Tips

• Keep your state as flat as possible.
• Mutations should be responsible for changing the state.
• Actions should be responsible for committing mutations and can contain asynchronous operations.

3. Code Examples

Example 1: Creating a Vuex Store

Create a store directory in your Nuxt.js project, and add an index.js file:

export const state = () => ({
  counter: 0
})

export const mutations = {
  increment (state) {
    state.counter++
  }
}

• state: a function that returns an object where the returned object is the data or state of the Vuex store.
• mutations: an object that contains methods to mutate the state.

Example 2: Accessing the State in a Component

You can access the state in your components using this.$store.state.<state_name>:

<template>
  <div>{{ this.$store.state.counter }}</div>
</template>

You can also use the mapState helper:

<template>
  <div>{{ counter }}</div>
</template>

<script>
import { mapState } from 'vuex'

export default {
  computed: {
    ...mapState({
      counter: state => state.counter
    })
  }
}
</script>

4. Summary

In this tutorial, you have learned how to integrate Vuex into a Nuxt.js project. You have seen how to set up a Vuex store and how to access the state in your components.

5. Practice Exercises

Exercise 1:
Create a new Nuxt.js application and integrate Vuex.

Exercise 2:
Create a Vuex store with a state that contains a list of todos. Add mutations to add and remove todos.

Exercise 3:
Create a component that displays the todos from the Vuex store. Add buttons to add and remove todos by committing the corresponding mutations.

Here are the solutions to the exercises above:

Solution to Exercise 1:
- Install Nuxt.js using create-nuxt-app.
- Vuex comes pre-configured in Nuxt.js. You can create a store directory and add index.js file to it.

Solution to Exercise 2:

export const state = () => ({
  todos: []
})

export const mutations = {
  addTodo (state, todo) {
    state.todos.push(todo)
  },
  removeTodo (state, todo) {
    state.todos = state.todos.filter(t => t !== todo)
  }
}

Solution to Exercise 3:

<template>
  <div>
    <div v-for="todo in todos" :key="todo">{{ todo }}</div>
    <button @click="addTodo">Add Todo</button>
    <button @click="removeTodo">Remove Todo</button>
  </div>
</template>

<script>
import { mapState } from 'vuex'

export default {
  computed: {
    ...mapState({
      todos: state => state.todos
    })
  },
  methods: {
    addTodo() {
      this.$store.commit('addTodo', 'New Todo')
    },
    removeTodo() {
      this.$store.commit('removeTodo', 'New Todo')
    }
  }
}
</script>

Tips for further practice:
- Try to integrate Vuex in a complex Nuxt.js project.
- Try to work with Vuex plugins.
- Try to debug Vuex state using vue-devtools.