A detailed introduction to the new Composition API in Vue 3

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The Composition API allows you to restructure code segments from options API, i.e., data, methods, and lifecycle hooks, by grouping all of your code that logically belongs together. The setup() function enables you to extract parts of components and group them logically together. It accepts props and the context object (with which you can emit events and data) as optional arguments. A composable is a function. To use composables.

An ultimate guide to the Vue 3 Composition API