vuejs nested v-for

<div v-for='(obj, key, index) in secondPanelDetails'
  v-bind:key='index'
  class='detail-wrapper'>
  <span>{{ key }}:</span>
  <span v-if='Array.isArray(obj)'>
    <div v-for='(el, index) in obj'
      v-bind:key='index'>
      {{ el }}
    </div>
  </span>
  <span v-else>{{ obj }}</span>
</div>
 new Vue({
  el: '#sample',
  data: {
    private: {
      folders : [{
          name : 'folder1',
          checks : [
            { name : 'check1.1' },
            { name : 'check1.2' }
          ]
        },
        {
          name : 'folder2',
          checks : [
            { name : 'check2.1' },
            { name : 'check2.2' }
          ]
        }
      ]
    }
  }
})

<script src="https://cdn.jsdelivr.net/vue/latest/vue.js"></script>
<div id="sample">
  <div v-if = "private.folders!=null" v-for="folder in private.folders">
  {{folder.name}}
      <div v-for="check in folder.checks">
          {{check.name}}
      </div>
  </div>
</div>