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React functional components
React functional components










  1. #React functional components how to
  2. #React functional components code

Create a functional component called MyInfo that returns the following UI: // a.

#React functional components code

For every input (props), functional components have exactly one output. Set up the basic React code from scratch // 2. You don’t also have to worry about hidden state or side effects. Earlier, React was mostly class-based because state was only supported in class components. It has a mandatory render () method which returns a JSX element. Since it is written as a plain javascript function, you can test a functional component like you test a function. React has two types of components: Class components Functional components As the name suggests, a class component is a JavaScript class extended to a React Component. On the other hand, you will have to write 24 lines of code if you declare it with a class-based component.

react functional components

With the functional component, you only need 14 lines of code for the Example component. The first code block declared with a class-based component, while the second code block declared with a functional component. import React from 'react'Įxport default function StatelessComponent() from 'react' īoth code blocks are the same components but declared different ways. This is a very basic component that you better write it as a functional component. A Simple Stateless ComponentĪ simple stateless component usually created when you need a reusable UI that don’t have any props/inputs or states. We can create any type of react component with a functional component, from a stateless component to a complex component that has states and lifecycles. With the existence of Hooks, React functional component can replace the class-based component as it’s easier and shorter to write, easy to test, and has better performance. import React from 'react' import ReactDOM from 'react-dom' import Demo from './App' ReactDOM.render (. Now, we can’t call it a stateless component anymore since it can also have states and lifecycles. Before Hooks introduced, it’s also known as a Stateless Component. There is no render method used in functional components. Component and create a render function which returns a React element.

react functional components

A class component requires you to extend from React. Why should you use Functional Component instead of Class Component?Ī Functional Component is a React Component declared with a plain javascript function that takes props and returns JSX. A functional component is just a plain JavaScript pure function that accepts props as an argument and returns a React element (JSX).Functional Component Lifecycle (useEffect Hook) Handling Callback (Passing data from child to parent component) A Stateful Component (with useState Hook)

react functional components

#React functional components how to

How to Write React Functional Component?.












React functional components