Vue Js Get first Two Character of String from JSON

<!DOCTYPE html>
<html lang="en">
<head>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
    <div id="app">
        {{myJson}}
        <p>Vue Js Get first Two Character of String from JSON</p>
        <ul>
            <li v-for="day in firstTwoDays" :key="day">{{ day }}</li>
        </ul>
    </div>

<script type="module">
        const app = new Vue({
            el: "#app",
            data() {
                return {
                    myJson: {
                        id: 24,
                        days: [
                            {
                                id: 1,
                                day: "monday",
                            },
                            {
                                id: 2,
                                day: "tuesday",
                            },
                            {
                                id: 3,
                                day: "wednesday",
                            },
                            {
                                id: 4,
                                day: "thrusday",
                            },
                            {
                                id: 5,
                                day: "friday",
                            }, {
                                id: 6,
                                day: "saturday",
                            },
                            {
                                id: 7,
                                day: "sunday",
                            }
                        ]
                    }
                }
            },
            computed: {
                firstTwoDays() {
                    return this.myJson.days.map(day => day.day.slice(0, 2));
                }
            }
        });
    </script>
    <style scoped>
        #app {
            background-color: lightblue;
            padding: 20px;
            font-family: Arial, sans-serif;
        }

p {
            font-size: 18px;
            font-weight: bold;
        }

ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }

li {
            font-size: 16px;
            margin-bottom: 10px;
        }
    </style>
</body>

</html>