💊React Interview Questions, Part I

Introduction to React and Thinking in React

React is an efficient, flexible, and open-source JavaScript framework/library that allows developers to the creation of simple, fast, and scalable web applications.

Scope of React: The selection of the right technology for application or web development is becoming more challenging. React has been considered to be the fastest-growing Javascript framework of all. The tools of Javascript are firming their roots slowly and steadily in the marketplace and the React certification demand is exponentially increasing. React is a clear win for front-end developers as it has a quick learning curve, clean abstraction, and reusable components. Currently, there is no end in sight for React as it keeps evolving.

1. What is React?

React is a front-end and open-source JavaScript library which is useful in developing user interfaces specifically for applications with a single page(SPA). It is helpful in building complex and reusable user interface(UI) components of mobile and web applications as it follows the components-based approach.

⚙️ The important features of React are:

✔️ It supports server-side rendering.

✔️ It will make use of the virtual DOM rather than the real DOM (Data Object Model) as RealDOM manipulations are expensive.

✔️ It allows unidirectional data binding or data flow.

✔️ It uses reusable or composable UI components for developing the view. 

2. What are the advantages of using React?

✔️ Use of Virtual DOM to improve efficiency:

React uses virtual DOM to render the view. As the name suggests, virtual DOM is a virtual representation of the real DOM. Each time the data changes in a react app, a new virtual DOM gets created. Creating a virtual DOM is much faster than rendering the UI inside the browser. Therefore, with the use of virtual DOM, the efficiency of the app improves.

✔️ Gently learning curve:

React has a gentle learning curve when compared to frameworks like Angular. Anyone with little knowledge of javascript can start building web applications using React.

✔️ SEO friendly:

React allows developers to develop engaging user interfaces that can be easily navigated in various search engines. It also allows server-side rendering, which boots the SEO of an app.

✔️ Reusable components:

React uses component-based architecture for developing applications. Components are independent and reusable bits of code. These components can be shared across various applications having similar functionality. The reuse of components increases the pace of development.

✔️ Huge ecosystem of libraries to choose from:

React provides you with the freedom to choose the tools, libraries, and architecture for developing an application based on your requirement.

3. What are the limitations of React?

🤦🏻 React is not a full-blown framework as it is only a library.

🤦🏻 The components of React are numerous and will take time to fully grasp the benefits of all.

🤦🏻 Coding might become complex as it will make use of online templating and JSX.

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