A React JS application consists of different components. It uses a JavaScript library to build an attractive and informative User Interface (UI). These components get many attributes such as HTML tags. These attributes are known as “Props” to React. Here props mean “Properties”.  They are together known as react prop types. These are read-only components. They are an important mechanism of React components. We can use these props as string, function or an array with valid JavaScripts.

The main use of React JS is to improve the speed of the apps by developing User Interfaces (UI). Further, we will discuss the different react prop types and their uses.

React Prop-types:

There are different react prop types. For example, bool (Boolean), Number, Func, array, object, any, symbol, etc. This react prop-types help in type checking. Type checking is useful to eliminate a certain number of errors before running the program. To run the type checking on props, we can assign a property such as “prop-types”. 

React prop types are used to document the different types of properties that are passed to components.

For example; the below commands will explain the basic type of checking.

import PropTypes from 'prop-types';class Greeting extends React.Component { render() {return ( 
Hello, {this.props.name} ); }}Greeting.propTypes = { name: PropTypes.string};

React/prop-types ESLint

ESLint is an open-source utility that is written in JavaScript. It’s a pluggable and configurable linting tool. It identifies and reports on patterns found in JavaScript. It is responsible for identifying the wrong proto-types. Linting is the process of running a program that analyzes any programmatic errors.

React ESLint is an analysis tool with static code. It also manages the issues relevant to code quality and code style. It supports different operating systems and the updated standards of ECMAScript. Moreover, the ESLint is a react plugin that can analyze the source code and informs the user about any error while reading the error that occurs at the time of coding conventions. 

Coding conventions shared by third parties can also reuse in addition to the actual codes. Here we can understand the setup of ESLint with a simple command. 

{    "rules": {        "semi": [2, "always"]    }}

The above command defines the “config” rule.

Using this plugin the users can set their own coding standards with flexibility by defining original rules of coding. 

To gain proficiency in this field, one should learn about React JS. This can be done by learning ReactJS Online Training through various online sources. It will enhance the skills to produce the work with high quality.

React prop types functional component:

There are two types of functional components in React. These react prop types components are known as Class components and function components. 

Function component: This is a valid React component as it accepts a single “prop” with data and returns an element of React. These function components are based on JavaScript. Companies with large customer base use react functional components such as Airbnb, Netflix, and Facebook. 

Class Component: Class components use ES6. These are also known as “stateful” components. They hold the values throughout the component. It can be known using a simple example. Such as:

 const Hello = ({name}) => 
Hello {name} 

React Props validation:

React props play an important role in this field. It just passes only the read-only attribute. Props must be placed correctly in the component otherwise the components may not behave properly. Hence the utilization of react props validation becomes necessary to improve the react components.

Props validation is a tool that helps developers to avoid problems and bugs that may occur in any future. React uses special kind of prop types that helps to capture bugs by validating different types of data. The usage of react prop types with its components will help to avoid unexpected bugs that come into the system. It will help react prop types users to maintain error-free systems.

Validating Props:

In React prop types components App.proptypes is used to validate props. If the props are invalid, the system will warn. So, it needs to specify validation patterns here. Valid react prop types pattern will run easily without errors.

Here the following syntax will explain it. :

class App extends React.Component {            render () {}  }  Component.propTypes = { /*Definition */};

React static prop types:

The ‘static’ keyword defines static methods in the class definition. It uses ES6 for this. It makes it static. To make the method static, it is necessary to add the prefix “static” to the keyword. The below implementation states that it is possible to define static methods but not the static properties.  

For example, 

// ES6class Person {  static count () {    return "I am a static method".  }} 

With the static keyword, the code looks more clear and better because its definition stays inside the class definition. It also needs static fields along with the methods. Static fields include strings, integers, and JSON other than functions. 

Thus, react allows assigning a JSON to a static field known as “prop-types” on the react component. To understand this react prop type we will use the following command.

// without transform-class-properties plugin import {React} from 'react'import Prop Types from 'prop-types'; class Person Component extends React. Component {  render() {    const { first Name, last Name } = this.props;    return 
      
 {first Name}       
 {last Name}       }} Person Component.propTypes = {  firstName: PropTypes.string,  lastName: PropTypes.string}

React component lifecycle:

In React JS, each component creation involves different methods of the lifecycle. These methods are referred to as the react component lifecycle. Moreover, The React component lifecycle explains about the way of components create. Basically this lifecycle of components is divided into four phases. Such as;

• Initial phase
• Mounting phase
• Updating phase
• Un-mounting phase 

Here we will elaborate on these phases.

Initial phase: It is the starting phase of the React JS component lifecycle. In this stage, the component starts its journey towards DOM. Here, a component contains the default props & initial state. The following methods can describe it. 

getDefaultProps() It specifies the “default” value of this.props.

getInitialState() It specifies the “initial” value of this.state.

Mounting phase: Here, we can create and insert a small example into the DOM for each component. The following method explains about it.

componentWillmount(): It is immediately applied before the component gets rendered into the DOM. In case, if the call setState() inserted in this method, the component won’t re-render.

componentDidmount(): It is immediately applied after the component gets rendered and placed into the DOM. 

Updating phase: It is the next phase of the lifecycle where we will get the latest props and state.  Moreover, this phase ensures that the component is displaying the updated version.

Un-mounting phase: This is the last phase of the React component lifecycle. This is called at the time when the component gets destroyed and unmounted from the DOM. It contains a single method only. Such as;  componentWillUnmount(): 

React JS supports data validation through different prop types. It is always a good practice to get validated data getting from props. Props are the way to share information between the components. It enables professional developers to create a web application that changes data without reloading pages. 

Conclusion:

React prop types are the mediums to pass any information between the different components. These help to validate data in React. React prop types ensure that components are using the same type of data that the user or programmer intended. These help in type checking. It ensures to remove the errors in the program before it starts. Thus, knowing the react prop types and their different components will help to get deeper into this field.

Thus, the above writing explains about the different React prop types and their components. Having good knowledge of Java, HTML5, CSS, etc. are prerequisites to learn React JS in-depth. Other than these, knowledge of ECMAScript will be an added advantage. ReactJS Training can be learned by both beginners and professionals. Depending upon the requirement, anyone can learn it having some coding knowledge.