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

Зміст курсу

React Tutorial

React Tutorial

componentDidMount()

The componentDidMount() lifecycle method is a hook in React that is called immediately after a component is mounted (inserted into the tree). This is the appropriate place to trigger an API call or perform any setup that requires the DOM to be fully rendered.

Here is an example of using componentDidMount() to make an API call and set the component's state with the response data:

In this example, the fetch function is called in the componentDidMount() lifecycle method to retrieve data from an API. The then method is called on the resulting promise, and the resolved value (the API response) is passed to setState, which updates the component's state and causes the component to re-render with the new data.

It's important to note that componentDidMount() is called only once, immediately after the component is mounted. If you need to trigger an update to a component based on a prop or state change, you should use another lifecycle method such as componentDidUpdate().

There are a few things to keep in mind when using the componentDidMount() lifecycle method in React:

componentDidMount() is the ideal place to initiate API calls or other asynchronous processes that need to happen once the component is mounted. Make sure to handle any errors that may occur during these processes, and to cancel any in-progress requests if the component unmounts before they are completed (for example, if the user navigates to a different page).
If you are making API calls or otherwise interacting with external data in componentDidMount(), make sure to consider the possibility that the data may not be available immediately. You may need to display a loading indicator or placeholder content while the data is being fetched.
Don't confuse componentDidMount() with the constructor() method, which is called before the component is mounted. The constructor() method is a good place to set up the initial state of the component, but it is not the best place to perform API calls or other asynchronous processes.

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