JavaScript How to update reactive Objects (and properties in general)? vue update reactive object

Vue.js documentation on Reactivity in Depth mentions that

a property must be present in the data object in order for Vue to convert it and make it reactive

(...)

you have to initialize Vue instances by declaring all root-level reactive data properties upfront, even just with an empty value

Consider these two code snippets, where tags is defined as an empty object and updated in the course of the script, in two different ways:

var vm = new Vue({
  el: "#root",
  data: {
    tags: {}
  }
});

vm.tags = {
  hello: true,
  world: true
};
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.3.3/vue.js"></script>
<div id="root">
  {{tags}}
</div>
Answer:1

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