From Vue.js in Action by Erik Hanchett
Because computed properties are typically calculated using instance data, their return value is updated automatically when the underlying data changes. Any view markup bound to the computed property is updated to reflect the new value as well.
This behavior is at the heart of the update cycle within the greater Vue instance lifecycle—let’s have a look…
From Isomorphic Web Applications by Elyse Kolker Gordon
This article, excerpted from chapter 4 of Isomorphic Web Applications: Universal Development with React