Vue Js Count frequency of each element in an array

<!DOCTYPE html>
<html>
<head>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
    <div id="app">
        <h2>Vue Js Find frequency of each element in an array</h2>
        <ul>
            <li v-for="(count, item) in frequency" :key="item">{{ item }}: {{ count }}</li>
        </ul>
    </div>
    <script>
        new Vue({
            el: '#app',
            data() {
                return {
                    array: ['Apple', 'Mango', 'Apple', 'Orange', 'Banana', 'Mango', 'Apple'],
                };
            },
            mounted() {
                this.groupDataByCategory();
            },
            computed: {
                frequency() {
                    return this.array.reduce((acc, item) => {
                        if (item in acc) {
                            acc[item]++;
                        } else {
                            acc[item] = 1;
                        }
                        return acc;
                    }, {});
                },
            },
        });
    </script>
</body>
</html>