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Commit 1717306

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Add composition API questions
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‎README.md‎

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@@ -235,8 +235,8 @@ List of 300 VueJS Interview Questions
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|226| [What happens if you use duplicate field names?](#what-happens-if-you-use-duplicate-field-names)|
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|227| [Why the component data must be a function?](#why-the-component-data-must-be-a-function)|
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|228| [What is the reason for recommendation for multi-word component names?](#what-is-the-reason-for-recommendation-for-multi-word-component-names)|
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|229| [](#)|
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|230| [](#)|
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|229| [How to use composition API in Vue2.0?](#how-to-use-composition-api-in-vue2.0)|
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|230| [What is composition API?](#what-is-composition-api)|
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1. ### What is VueJS?
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**Vue.js** is an open-source, progressive Javascript framework for building user interfaces that aim to be incrementally adoptable. The core library of VueJS is focused on the `view layer` only, and is easy to pick up and integrate with other libraries or existing projects.
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**[⬆ Back to Top](#table-of-contents)**
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229. ### ?
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229. ### How to use composition API in Vue2.0?
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Even though the Composition API is a part of Vue 3, it has been made available for Vue 2 as well by installing `@vue/composition-api` as a plugin via `Vue.use()`.
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Let's see the usage in step by step instructions,
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1. Run the below commands to install
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```javascript
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npm install @vue/composition-api
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# or
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yarn add @vue/composition-api
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```
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2. After that import this API in your main.js file,
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```js
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import Vue from 'vue'
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import VueCompositionAPI from '@vue/composition-api'
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Vue.use(VueCompositionAPI)
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```
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3. Now your project is able to use composition API
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```js
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// use the APIs
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import { ref, reactive } from '@vue/composition-api'
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```
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**[⬆ Back to Top](#table-of-contents)**
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230. ### ?
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230. ### What is composition API?
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Composition API is a set of additive, function-based APIs that allow flexible composition of component logic.
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**[⬆ Back to Top](#table-of-contents)**

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