Vue Js change or update first value of array

<!DOCTYPE html>
<html>

<head>
  <script src="https://unpkg.com/vue@3.2.12/dist/vue.global.js"></script>
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0-beta3/css/all.min.css">
</head>
<body>
  <div id="app">
    <h3>Vue Js change or update first value of array</h3>
    <p>Original Array: {{ myArray }}</p>
    <button @click="updateFirstValue(10)">Update First Value</button>
  </div>

app.mount('#app');
  </script>

h3 {
      font-size: 24px;
      margin-bottom: 20px;
    }

</style>

</body>

</html>