Beginner LevelVue JS
What is the difference between Options API and Composition API in Vue 3?
❓ Interview Prompt: Compare Options API and Composition API regarding code organization, TypeScript support, and reusability.
Vue 3 provides two programming styles for writing components:
Options API ('data', 'methods', 'computed', 'mounted'):
•
Organizes code by option type (all reactive state in 'data()', all functions in 'methods:').
•
Easy to learn for beginners, but in complex components, logic related to a single feature (like user authentication or search filtering) gets scattered across multiple options.
•
Poor TypeScript inference due to 'this' binding.
Composition API ('<script setup>' + 'ref', 'reactive', 'computed'):
•
Organizes code by logical concern. All variables and functions for a specific feature can be grouped together.
•
Enables clean logic reuse via Composables (custom functions using Vue reactivity hooks), replacing legacy Mixins.
•
First-class TypeScript support without 'this' overhead.
Best Practice (2026):
Use '<script setup>' (Composition API) by default for modern Vue 3 projects.
Code Implementation Example
html
<!-- Options API (Vue 2 style) -->
<script>
export default {
data() { return { count: 0 }; },
methods: { increment() { this.count++; } }
}
</script>
<!-- Composition API with <script setup> (Vue 3 standard) -->
<script setup>
import { ref } from 'vue';
const count = ref(0);
const increment = () => count.value++;
</script>
<template>
<button @click="increment">Count: {{ count }}</button>
</template>💡Options API vs Vue 3 Composition API with <script setup> syntax.
🎯 Interview Key Takeaway
Composition API with <script setup> organizes code by logical features, improves TypeScript inference, and enables composables.
#Vue 3#Composition API#Options API#Beginner
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