Vue Js mask a string with asterisks (*) show only last 4 digit

<!DOCTYPE html>
<html>
<head>
  <script src="https://unpkg.com/vue@3.2.12/dist/vue.global.js"></script>
</head>
<body>
  <div id="app">
    <h3>Vue Js mask a string with asterisks (*) show only last 4 digit</h3>
    <p>Original Number: {{ originalNumber }}</p>
    <p>Masked Number: {{ maskedNumber }}</p>
  </div>

const maskedDigits = '*'.repeat(this.originalNumber.length - 4);
          const lastFourDigits = this.originalNumber.slice(-4);

return maskedDigits + lastFourDigits;
        }
      }
    });

app.mount('#app');
  </script>
  <style>
    #app {
      text-align: center;
      box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
      width: 600px;
      margin: 0 auto;
      padding: 20px
    }
  </style>

</body>

</html>