vue js v-for array index

<!-- To gain access to the array index: -->
<ul>
    <li v-for="(game, index) in games"></li>
</ul>
<!--
	You only want the index in specific cases. Use `:key` as
	standard. See the other greps.
-->

<ul>
  <li v-for="(val, index) in arr">
    <!-- Do something... -->
  </li>
</ul>

<option v-for="(location, index) in locations" v-bind:value="location.id" v-bind:selected="index === 0">
  {{ location.from }} - {{ location.to }}
</option>

<ul>
  <li v-for="(item, index) in items">
    {{ index }} - {{ item }}
  </li>
</ul>