Vue 3 Composition API

Vue 3 introduces the Composition API to make logic reuse and code organization simpler and more scalable.

Why Composition API?

• Better code reuse via composables
• Improved TypeScript support
• Cleaner component logic separation

Creating a Composable

export function useCounter() {\n  const count = ref(0);\n  const increment = () => count.value++;\n  return { count, increment };\n}

Using in a Component

setup() {\n  const { count, increment } = useCounter();\n  return { count, increment };\n}

Tips

• Group related state and logic
• Return only reactive refs
• Keep composables focused and small

Conclusion

The Composition API enables cleaner, more modular Vue apps—especially in large codebases.