Full-Stack Vue.js 2 and Laravel 5

Principle #1 – Single source of
truth
Components may have local data that only they need to know about. For
example, the position of the scroll bar in the user list component is probably of
no interest to other components: Vue.component('user-list', { data() { scrollPos:
... } });
But any data that is to be shared between components, for example application
data, needs to be kept in a single place, separate from the components that use it.
This location is referred to as the store. Components must read application data
from this location and not keep their own copy to prevent conflict or
disagreement:
Figure 8.2. Centralized data simplifies application state