React Tutorial

React Tutorial

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1. Getting Started

The prompt provides a list of terms that are commonly used in React, a popular JavaScript library for building user interfaces. The terms include React, component, virtual DOM, JSX, constructor() method, render() method, state, setState() method, props, and binding methods. The prompt does not provide any additional context or information about these terms.

What is a Component?

State and setState()

Props (properties)

Binding Methods

2. Lifecycle Methods

Now that we have become familiar with most of the React basics and how components work and integrate into the development of a website. Since we know that React components are loaded onto the main page and then can be dynamically updated which means that they go through a certain cycle of stages that can be intervened in and the behavior can be updated. This cycle can be manipulated through what are called lifecycle functions at different stages. React class component lifecycle methods are used for a variety of purposes, including performing setup tasks when a component is first rendered, updating a component in response to changes in props or state, and cleaning up any resources that the component is using.

componentWillMount()

componentWillUnmount()

componentDidMount()

shouldComponentUpdate()

componentDidUpdate()

componentDidCatch()

Overview of Component Lifecycle

3. Functional Components and Hooks

Now that we have gone over the basics of class-based components, we will now explore a better and more concise way to write React components with functional components which are a lot more commonly used in React these days. Functional components are a way to define components in React that are simple, lightweight, and only consist of a render function. They are a great choice for simple, presentational components that only need to render some JSX and don't have their own state or lifecycle methods. In this section of the course, we'll look at how to use functional components with Hooks to manage state and other lifecycle events.

What is a Hook?

4. Advanced Topics

Now, we understand the basics of React with regards to the various kinds of components available and how to use them and exploit their lifecycle to our advantage in a webpage, we will now move on to some advanced topics. These topics will deal with topics like state management through Context API and the Consumer and Provider architecture in React and how these things make life easier in a production-level React App. Then we will move onto Routing in react and how it all works to produce a navigable React App without having to reload the page. This involves studying an important React package called “react-router-dom” which we will get into in this section.

React Router Dom

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React Tutorial

React Tutorial

componentWillUnmount()

In React, the componentWillUnmount() lifecycle method is called just before a component is unmounted from the DOM. This method is useful for cleaning up any resources or state changes that have been made in the component.

Here is an example of how componentWillUnmount could be used in a React component:

In this example, the componentWillUnmount method cancels any pending network requests and removes any event listeners that were added to the component.

Here is another example of how componentWillUnmount could be used in a React component:

In this example, the componentWillUnmount method clears any timers that were set in the component and saves any data to local storage.

It's important to note that this method is called just before the component is unmounted, not when it is re-rendered. If you need to perform any cleanup when a component is re-rendered, you should use the componentDidUpdate lifecycle method instead.

Additionally, it's recommended to avoid performing any complex logic or operations in this method, as it can negatively impact the performance of your application. This method should be used only for simple cleanup tasks.

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