How to use Vuex for state management in Vue.js

Vuex is a state management library for Vue.js applications. It helps manage the state of your application in a centralized way, making it easier to handle complex data flow and state changes. Here's a basic guide on how to use Vuex in a Vue.js application along with some additional resource links:

1. Install Vuex

You can install Vuex using npm or yarn:

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# Using npm
npm install vuex

# Using yarn
yarn add vuex

2. Set up the Vuex Store

Create a new file, usually named store.js, to set up your Vuex store. The store contains the application state, mutations, actions, and getters.

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// store.js
import Vue from 'vue';
import Vuex from 'vuex';

Vue.use(Vuex);

const store = new Vuex.Store({
  state: {
    // Your application state goes here
    counter: 0,
  },
  mutations: {
    // Mutations are used to modify the state
    increment(state) {
      state.counter++;
    },
    decrement(state) {
      state.counter--;
    },
  },
  actions: {
    // Actions are used to perform asynchronous operations and commit mutations
    asyncIncrement({ commit }) {
      setTimeout(() => {
        commit('increment');
      }, 1000);
    },
  },
  getters: {
    // Getters are used to compute derived state
    doubleCounter: (state) => state.counter * 2,
  },
});

export default store;

3. Integrate Vuex in Your Vue.js Application

In your main application file (usually main.js), import and use the Vuex store:

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// main.js
import Vue from 'vue';
import App from './App.vue';
import store from './store';

new Vue({
  render: (h) => h(App),
  store, // Register the Vuex store
}).$mount('#app');

4. Access State, Mutations, Actions, and Getters in Components

You can access Vuex features in your Vue components using mapState, mapMutations, mapActions, and mapGetters helpers or by directly using this.$store.

Example using mapState and mapActions in a component:

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// MyComponent.vue
<template>
  <div>
    <p>Counter: {{ counter }}</p>
    <p>Double Counter: {{ doubleCounter }}</p>
    <button @click="increment">Increment</button>
    <button @click="asyncIncrement">Async Increment</button>
  </div>
</template>

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

export default {
  computed: {
    ...mapState(['counter', 'doubleCounter']),
  },
  methods: {
    ...mapActions(['increment', 'asyncIncrement']),
  },
};
</script>