what is v-for language called in vue code example

Example 1: vue v-for object

// object: {
//   title: 'How to do lists in Vue',
//   author: 'Jane Doe',
//   publishedAt: '2016-04-10'
// }
<div v-for="(value, name, index) in object">
  {{ index }}. {{ name }}: {{ value }}
</div>

Example 2: vue js v-for array index

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