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I'm trying to understand when to use React functional components vs. classes and reading from the docs they don't really go into detail. Can you give me some primary examples of the below of when you would want a specific feature of a class to make a component?
A functional component is less powerful but is simpler, and acts like a class component with just a single render() method. Unless you need features available only in a class, we encourage you to use functional components instead.
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Whereas, function components render the interface whenever the props are changed. Although we should prefer using function components most times as React also allows using state with function components in React version 16.8 and later by using the useState hook, which is also recommended by Meta (Facebook App) itself.
There is essentially no difference between a functional component and a class component that just implements the render method, other than the syntax. If you're trying to boost performance by eliminating unnecessary renders, both approaches provide support.
There is an opinion that functional components show a greater performance compared to class components. The point is that the React functional element is a simple object with 2 properties: type(string) and props(object). To render such a component React needs to call the function and pass props – that is all.
Components are independent and reusable bits of code. They serve the same purpose as JavaScript functions, but work in isolation and return HTML. Components come in two types, Class components and Function components, in this tutorial we will concentrate on Function components.
Functional components can accept and use props. Functional components should be favored if you do not need to make use of React state. import React from "react"; const Person = props => ( <div> <h1>Hello, {props.name}</h1> </div> ); export default Person; Class components make use of ES6 class and extend the Component class in React.
Functional Components: Functional components are some of the more common components that will come across while working in React. These are simply JavaScript functions. We can create a functional component to React by writing a JavaScript function. Class Component: This is the bread and butter of most modern web apps built in ReactJS.
Now, here’s the equivalent component as a class component. This is simply an ES6 class that has a render method which returns the JSX to be rendered. In React, state refers to an object inside a component that is used to store property values that belong to that component. When this state object changes, the component re-renders.
Now you can use a Hook inside the existing function component to manage the state and no need to convert it into the Class component. Instead of Classes, one can use Hooks in the Functional component as this is a much easier way of managing the state. Hooks can only be used in functional components, not in-class components.
You only need a class component when you:
componentDidCatch You only need a class component when you:
componentDidMount etc.
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