alpine2.html

<div
    x-data="{
        search: '',
 
        items: ['foo', 'bar', 'baz'],
 
        get filteredItems() {
            return this.items.filter(
                i => i.startsWith(this.search)
            )
        }
    }"
>
    <input x-model="search" placeholder="Search...">
 
    <ul>
        <template x-for="item in filteredItems" :key="item">
            <li x-text="item"></li>
        </template>
    </ul>
</div>