Why Composition API?
Limitations of Options API, logic reuse problem, Composition API advantages.
The Two Ways to Write Vue
Vue 3 gives you two styles for authoring component logic: the Options API and the Composition API. Both produce the same end result, but they organize code very differently.
Understanding the trade-offs helps you pick the right tool and read existing codebases with confidence.
How the Options API Organizes Code
The Options API splits a component into fixed sections: data, computed, methods, watch, and lifecycle hooks. Each piece of a feature lives in a different section.
For one small feature you might touch four separate blocks of the file.
export default {
data() {
return { count: 0 }
},
computed: {
doubled() { return this.count * 2 }
},
methods: {
increment() { this.count++ }
}
}