In simple terms, React developers are front-end developers highly experienced in using React and React Native. React developers create delightful user interfaces by applying their knowledge of JavaScript. If full-time React developers have engaged in learning the MERN stack, they’re also proficient in Express, MongoDB and Node.js. Although most organisations today do not require knowledge of the MERN stack, learning this popular tech stack is almost a right of passage for developers. In addition to their tech stack, React developers will be experienced in varying other capacities based on the organizations they’ve worked for and the tasks they’ve engaged in.

Listed below are the benefits of hiring React developers:

• Only a few developers are required

Using react native is very cost-efficient since almost 90% of the codebase can be used throughout the platforms without having expert knowledge of the different programming languages.

• It is time-efficient

React lowers the amount of time required to generate innovative products. The open-source technology strengthens the developer community, and in turn, they receive better feedback and improved code. Additionally, the availability of hot reloading provides instant modifications to the code, enabling the app to run efficiently even as the UI is being edited.

• It enhances performance

React enables developers to seamlessly convert web applications to mobile versions without consuming much time. As developers are no longer required to write code from scratch, it saves companies valuable resources that would otherwise be spent on app development. In addition, React Native can achieve 60fps, thereby delivering better application performance due to the UI running more smoothly.

• It generates functionality and agility 

Developers build applications with diverse features through React using existing codes themselves. They can be as agile as needed while generating their apps on a fully functional back-end. Since React uses the programming language JavaScript, it can work across all platforms, making building through React extremely functional for the developers.

• JSX stands for JavaScript XML. It allows us to write HTML in React. JSX also makes it easier to write and add HTML in React.

• JSX allows us to write HTML elements in JavaScript and place them in the DOM without any createElement()  and/or appendChild() methods.

• It converts HTML tags into react elements.

Example 1 [using JSX]

const myelement = <h1>I Love JSX!</h1>;

ReactDOM.render(myelement, document.getElementById('root'));

You do not have to use JSX. However, JSX makes it easier to write React applications.

Here is the same code as in the above example written without JSX:

Example 2 [without using JSX]

const myelement = React.createElement('h1', {}, 'I do not use JSX!');
	                                            
ReactDOM.render(myelement, document.getElementById('root'));

In above Example 1, JSX allows the writing of HTML directly within the JavaScript code.

JSX is an extension of the JavaScript language based on ES6, which is translated into regular JavaScript at runtime.

Keys help React identify which items have changed, which terms are added, or which are removed. Keys should be given to the elements inside the array to give the elements a stable identity.

const numbers = [1, 2, 3, 4, 5];

const listItems = numbers.map((number) =>

?
<li key={number.toString()}>

  {number}

 </li>

);

When the state of your component changes, the render function will return a new tree of React elements, different to the previous/current one.

In React components, props are variables passed to it by its parent component. State although is still a variable, it is directly initialized and managed by the component. The state can also be initialized by props.

For eg. a parent component may include a child component by calling:

<ChildComponent />

The parent can pass a prop by using the syntax:

class ChildComponent extends React.Component {

 constructor(props) {

   super(props)

   console.log(props.color)

 }

}

And any other method in this class can reference the props using:

this.props.

Props can be used to set the internal state based on a prop value in the constructor:

class ChildComponent extends React.Component {

 constructor(props) {

   super(props)

   this.state.colorName = props.color

 }

}

The component can also initialize the state without looking at props.

Props should never be changed in a child component, so if there’s something going on that alters some variable, that variable should belong to the component state. In addition, props are used to allow child components to access methods that are defined in parent components. This is a means of centralizing the state management in the parent component and to avoid children having to need their own state.

Most components will simply display some sort of information based on the received props and continue to remain stateless.