Full-Stack Vue.js 2 and Laravel 5

Saved state
The ListingSave component does not have any local data; we will instead keep any
saved listings in our Vuex store. To do this, we will create an array in the store
called saved. Each time the user toggles the saved state of a listing its ID will be
either added or removed from this array.
To begin, let's add a state property to our Vuex store. This object will hold any
data we want to be globally available to the components of our app. We will add
the saved property to this object and assign it an empty array.
resources/assets/js/store.js: ...
export default new Vuex.Store({ state: { saved: [] } });