{"id":29581,"date":"2022-05-27T07:16:00","date_gmt":"2022-05-27T07:16:00","guid":{"rendered":"https:\/\/www.emizentech.com\/blog\/?p=29581"},"modified":"2022-06-13T10:05:56","modified_gmt":"2022-06-13T10:05:56","slug":"types-of-react-components","status":"publish","type":"post","link":"https:\/\/multisitelocal.ezxdemo.com\/blog\/types-of-react-components.html","title":{"rendered":"Types of ReactJs Components in Programming"},"content":{"rendered":"\n

<\/span>What Are Components in ReactJs?<\/span><\/h2>\n\n\n\n

The components basically refer to the fundamental unit and building blocks of React. To make it easier to understand, just like anything in the world is made up of atoms, the components are just the constituents of ReactJS. Any application or website being developed using ReactJS<\/a> will be made up of the different units which are called the components.<\/p>\n\n\n\n

\"UI<\/figure>\n\n\n\n

In the image shown above, you can find several components on the UI of the website. The Menu bar is one component while the left Featured column is another. The cookie box is also a component and the main body providing all the information is again just another. So the whole UI is made up of the different components to make the website useful for us. The UI of the website thus can be considered as the parent component.<\/p>\n\n\n\n

<\/span>Types of ReactJs Components in Programming <\/span><\/h2>\n\n\n\n

<\/span>1. Functional Component <\/span><\/h3>\n\n\n\n

Functional components can be created simply by writing the Javascript functions. To be specific, the functional components are those functions that take the Props in and return the JSX. The functional components might or might not be able to receive the data in form of parameters. Moreover, the functional components don’t have the lifecycle methods or state however they can be added by simply implementing the React Hooks. The functional components are always easy to debug, read and test. <\/p>\n\n\n\n

\/\/ Functional Component Example\nimport React from 'react';\nconst HelloWorld = () => {\n   return (\n      <div>\n         <p>Hello Emizen!<\/p>\n      <\/div>\n   )\n}\nexport default HelloEmizen;<\/code><\/pre>\n\n\n\n
In the above code image, it is a simple component carrying the constant variable “Hello Emizen”. The constant variable is assigned to the arrow function that returns the JSX. The functional components don\u2019t require to be an arrow function and they can also be simply declared with the regular JavaScript functions. At the same time, Props can also be passed into the function and thus used to render the data in JSX code.<\/p>\n\n\n\n
<\/span>2. Class Component <\/span><\/h3>\n\n\n\n
The Class component is the most used component among all the types. The reason is that the class component has the capability of performing every function of the functional component and at the same time some additional capabilities as well. It can efficiently make use of the main functions of React, props, state and lifecycle methods as well. However, the class components are comparatively more complex compared to that of functional components. The data can be passed from one class component to another class component very easily.<\/p>\n\n\n\n
\/\/ Class Component Exampleimport React from 'react';class HelloWorld extends React.Component {\n   render() {\n      return (\n         <div>\n            <p>Hello Emizen!<\/p>\n         <\/div>\n      )\n   }\n}export default HelloEmizen;<\/pre>\n\n\n\n
It can be observed in the above example that the class component uses the extends React.Component<\/code> after the class Hello Emizen<\/code>. Then, it also requires the render()<\/code> method to return the JSX code. In the class component, one can declare a state, set it to the JavaScript object, and use props<\/code> to be in the initial stage and change the state in the lifecycle methods. It will require the React Hooks to perform these actions by functional component.<\/p>\n\n\n\n
<\/span>3. Pure Component<\/span><\/h3>\n\n\n\n
Pure components are the most simple and fast components that someone can write. As pure components don\u2019t modify or depend on the state of different variables outside of their scope, they can easily replace the simple functional components. The components which merely return the render function are most adequate for pure components. The biggest use case of the Pure component is to provide optimizations. <\/p>\n\n\n\n
The big difference between the React.Component<\/code> and React.PureComponent<\/code> is that the pure component exhibits shallow comparison <\/strong>on the state change. The pure components automatically manage the shouldComponentUpdate()<\/code>.<\/p>\n\n\n\n
React Components are re-rendered mostly when: <\/p>\n\n\n\n