VueJs State Management

Introduction

VueJs is a frontend framework that makes it easy to build web applications. To manage state in the application, VueJs provides Vuex, a state management pattern and library. Vuex allows the application's state to be centralized in one store, making it easy to manage and update.

Syntax

import Vuex from 'vuex';

const store = new Vuex.Store({
  state: {
    count: 0
  },
  mutations: {
    increment (state) {
      state.count++
    }
  },
  actions: {
    incrementAsync ({ commit }) {
      setTimeout(() => {
        commit('increment')
      }, 1000)
    }
  }
})

Example

<template>
  <div class="counter">
    <h1>{{ count }}</h1>
    <button @click="incrementCount">Increment</button>
  </div>
</template>

<script>
import { mapState, mapActions } from 'vuex'

export default {
  computed: mapState(['count']),
  methods: mapActions(['incrementAsync']),

  mounted () {
    this.incrementAsync()
  }
}
</script>

Explanation

In the above example, the state object has a single property count that is initialized to 0. The mutations object defines the increment mutation that is used to update the state. The actions object defines the incrementAsync action that is used to commit the increment mutation asynchronously.

In the Vue component, the mapState function is used to map the count property from the store's state to a computed property in the component. The mapActions function is used to map the incrementAsync action to a method in the component.

Use

Vuex allows state management in a Vue application to be centralized in one store, making it easy to manage and update. It provides several key features that make it a valuable tool when building complex applications:

• Centralized state management: Vuex provides a central store that contains all of the state for the application. Components can access and update the state through the store.
• Predictable state changes: Mutations are used to update the state and must be synchronous. This ensures that state changes are predictable and easy to debug.
• Asynchronous state changes: Actions can be used to perform asynchronous operations and commit mutations to update the state.
• Scoped modules: Large applications can be split into modules that have their own state, mutations, actions, and getters.

Important Points

• Vuex is a state management pattern and library for VueJs applications.
• Vuex provides a centralized store to manage state, mutations to update state, and actions to perform asynchronous operations.
• Vuex makes it easy to manage state in complex applications by providing a predictable and centralized way to manage state.

Summary

Vuex is an essential tool for building complex VueJs applications. It provides a centralized store to manage state and a set of tools to manage state mutations and asynchronous operations. By using a centralized store for application state, Vuex makes it easy to manage state across multiple components and makes the application more predictable and debuggable.