A computed property calculates a value from other data and is cached until its dependencies change.
Use computed properties instead of long expressions in templates.
Vue Computed Properties
Values derived from other data.
✍️ 3 exercises + code challenge in this lessonKey Takeaways: Vue Computed Properties
Mastering Vue Computed Properties helps you write clean and reliable Vue.js code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
Vue Computed Properties Code Example
Vue.js<script src="https://unpkg.com/vue@3.5.12/dist/vue.global.prod.js"></script>
<div id="app">
<p v-for="item in cart" :key="item.name">{{ item.name }}: Rs {{ item.price }} × {{ item.qty }}</p>
<h3>Total: Rs {{ total }}</h3>
<p>{{ itemCount }} items</p>
</div>
<script>
Vue.createApp({
data() {
return { cart: [ { name: "Pen", price: 50, qty: 3 }, { name: "Notebook", price: 250, qty: 2 } ] };
},
computed: {
total() { return this.cart.reduce((sum, i) => sum + i.price * i.qty, 0); },
itemCount() { return this.cart.reduce((sum, i) => sum + i.qty, 0); }
}
}).mount("#app");
</script>
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Vue Computed Properties Practice Exercises
Check what you learned in “Vue Computed Properties”.
/ 3 solved
Fill in the blank
Declare computed properties.
: { total() { return this.a + this.b; } }
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Multiple choice
What is special about computed properties?
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Code challenge
Add a computed property fullName that returns first + " " + last and show it in the <p>.
Write the code in the live editor. Your answer is checked automatically.
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