Sifa iliyohesabiwa ni thamani tendaji inayotokana na hali tendaji nyingine. Inahesabuwa tena kiotomatiki wakati utegemezi wake unabadilika, na — muhimu sana — huhifadhi matokeo yake ili ikaendesha tena tu wakati kitu inachotegemea hubadilika kweli.
vue
<script setup>
import { ref, computed } from "vue";
const firstName = ref("Ann");
const lastName = ref("Lee");
const fullName = computed(() => `${firstName.value} ${lastName.value}`);
// fullName updates automatically whenever firstName OR lastName changes
</script>
<template>
<p>{{ fullName }}</p> <!-- auto-unwrapped, like a ref -->
</template>