vuex getter

A Vuex getter is a function that retrieves and returns a specific piece of state from the Vuex store. Getters are used to compute derived state based on the current state, such as filtering or sorting an array of data.

In Vuex, getters are defined as functions in the getters object of the store. Getters take two arguments: the state object and other getters. The state argument is the current state of the store, while the second argument is an object that contains all the getters defined in the store.

Here is an example of a simple getter that returns a filtered list of items from the store:

const store = new Vuex.Store({
  state: {
    items: [
      { id: 1, name: 'Item 1', completed: true },
      { id: 2, name: 'Item 2', completed: false },
      { id: 3, name: 'Item 3', completed: true }
    ]
  },
  getters: {
    completedItems: state => {
      return state.items.filter(item => item.completed)
    }
  }
})

In this example, the completedItems getter returns an array of items that have the completed property set to true. The getter can be accessed from a component using this.$store.getters.completedItems.