What is map Getter helper?157

 What is map Getter helper?

In Vuex, the mapGetters helper is a handy tool that simplifies accessing and using getters within your components. It essentially maps one or more getters from the Vuex store to computed properties in your component, saving you from manually accessing them with this.$store.getters.

Here's how it works:

1. Import mapGetters:

First, you need to import the mapGetters helper from the Vuex library:

JavaScript

import { mapGetters } from 'vuex'

2. Use it in your computed property:

Inside your component's computed property section, call mapGetters with an array of getter names you want to map:

JavaScript

computed: {
  ...mapGetters([
    'completedTodosCount',
    'loggedInUser',
    // ... other getters you need
  ]),
  // your other local computed properties
},

3. Access the mapped getters:

The mapped getters become accessible as simple computed properties within your component. You can use them directly in your template and logic just like any other computed property:

HTML

<template>
  <span>Completed Todos: {{ completedTodosCount }}</span>
  <p>Welcome, {{ loggedInUser.name }}</p>
</template>

<script>
export default {
  // ...
  computed: {
    ...mapGetters([
      'completedTodosCount',
      'loggedInUser',
    ]),
  },
}
</script>

Benefits of using mapGetters:

• Reduced boilerplate: It eliminates the need to write individual computed properties for each getter you want to use.

• Improved readability: Your code becomes cleaner and more concise, with getters accessed directly as properties.

• Centralized state management: Keeps state access organized and logical within the store.

• Automatic re-rendering: When the underlying state changes, the mapped getters automatically update and trigger re-renders in your component.

Additional features:

• You can customize the mapped property names:

JavaScript

...mapGetters({
  customCompletedTodosCount: 'completedTodosCount',
  user: 'loggedInUser',
}),

• You can map getters from different modules within the store:

JavaScript

...mapGetters({
  todosCount: 'todos/completedTodosCount',
  userProfile: 'users/getProfile',
}),

Overall, mapGetters is a powerful tool in Vuex that makes accessing and using getters much easier and more efficient. It promotes clean, maintainable code and simplifies communication between your components and the state managed by Vuex.

I hope this explanation clarifies the purpose and benefits of the mapGetters helper! Feel free to ask if you have any further questions about Vuex or its related concepts.