title: How to get checked value of checkbox if use array as a model in vue
body: <p>I wonder if I use array as model for multiple-checkbox list, how can I check which items is checked and which are unchecked efficiently rather than compare one by one with that array?</p>
  
  <pre><code>&lt;ul&gt;
  &lt;li v-for="task in tasks"&gt;
  &lt;input type="checkbox" :id="task.title" :value="task" v-model="selectedTasks" @change="handleTasks(task)"&gt;
  &lt;label :for="task.title"&gt;{{task.title}}&lt;/label&gt;
  &lt;/li&gt;
  &lt;/ul&gt;
  
  
  new Vue({
    data: {
        tasks: [
          { title: 'Go to the store' },
          { title: 'Clean the house' },
          { title: 'Learn Vue.js' }
        ],
        selectedTasks: []
    },
  })
  </code></pre>