Déjà vu

Déjà-vue is a popular JavaScript library used for creating interactive and dynamic user interfaces. It is based on the Vue.js framework and provides additional functionality for managing state, routing, and data fetching.

In this tutorial, we will go through the basics of Déjà-vue and how to set up a basic application using it.

Installation

To start using Déjà-vue, you first need to install it via npm or yarn. You can do this by running the following command:

npm install deja-vue

or

yarn add deja-vue

Setting up a Déjà-vue application

Once you have installed the library, you can start setting up a Déjà-vue application. You can do this by creating a new Vue.js application and adding Déjà-vue as a plugin.

import Vue from 'vue'
import DejaVue from 'deja-vue'

Vue.use(DejaVue)

After setting up Déjà-vue, you can start using its features like state management, routing, and data fetching in your Vue components.

State management

Déjà-vue provides a state management feature similar to Vuex, which allows you to manage the state of your application in a centralized manner. You can define your store using the following syntax:

const store = {
  state: {
    count: 0
  },
  mutations: {
    increment(state) {
      state.count++
    },
    decrement(state) {
      state.count--
    }
  }
}

You can then access the state and mutations in your Vue components like this:

export default {
  computed: {
    count() {
      return this.$store.state.count
    }
  },
  methods: {
    increment() {
      this.$store.commit('increment')
    },
    decrement() {
      this.$store.commit('decrement')
    }
  }
}

Routing

Déjà-vue also provides a routing feature similar to Vue Router, allowing you to create routes for your application. You can define your routes using the following syntax:

const routes = [
  { path: '/', component: Home },
  { path: '/about', component: About }
]

You can then set up routing in your Vue application like this:

const router = new DejaVueRouter({
  routes
})

new Vue({
  router,
  render: h => h(App)
}).$mount('#app')

Data fetching

Déjà-vue also provides a data fetching feature, allowing you to fetch data from APIs and manage it in your application. You can define your data fetching logic in your Vue components like this:

export default {
  data() {
    return {
      posts: []
    }
  },
  async created() {
    this.posts = await this.$fetch('https://jsonplaceholder.typicode.com/posts')
  }
}

Conclusion

Déjà-vue is a powerful and versatile JavaScript library that can help you build dynamic and interactive user interfaces. In this tutorial, we covered the basics of Déjà-vue, including state management, routing, and data fetching. With this knowledge, you can start building your own Déjà-vue applications and take advantage of its features to create rich user experiences.