<script setup>
import { ref, onMounted } from 'vue'
// reactive state
const count = ref(0)
// functions that mutate state and trigger updates
function increment() {
count.value++
}
// lifecycle hooks
onMounted(() => {
console.log(`The initial count is ${count.value}.`)
})
</script>
<template>
<button @click="increment">Count is: {{ count }}</button>
</template>
<script setup>
import { reactive, computed } from 'vue'
const author = reactive({
name: 'John Doe',
books: [
'Vue 2 - Advanced Guide',
'Vue 3 - Basic Guide',
'Vue 4 - The Mystery'
]
})
// a computed ref
const publishedBooksMessage = computed(() => {
return author.books.length > 0 ? 'Yes' : 'No'
})
</script>
<template>
<p>Has published books:</p>
<span>{{ publishedBooksMessage }}</span>
</template>
