title: vue.js best way to update entire array
body: <p>What is the best way to update the entire observed array and trigger a rerender in vue.js without having to iterate an push all the items?</p>
  <p>I have read the documentation here:
  <a href="https://v2.vuejs.org/v2/guide/list.html#Replacing-an-Array" rel="nofollow noreferrer">https://v2.vuejs.org/v2/guide/list.html#Replacing-an-Array</a></p>
  <p>But it doesn't make sense to me having to filter, concat or slice just to update the array? There must be something I missed?</p>