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

Conteúdo do Curso

React Tutorial

React Tutorial

componentDidCatch()

componentDidCatch is a lifecycle method in React that is called when a component throws an error during rendering, in a lifecycle method, or in the constructor of the component. It receives two arguments: error and info, which contain information about the error that was thrown.

Here is an example of how you might use componentDidCatch to handle errors in a component:

In this example, the MyComponent component has a state called hasError, which is set to true if an error is caught. The component will then render a message saying that an error occurred, rather than rendering the children's elements.

You can also use the error and info arguments to log the error and additional information to an error reporting service or to display more detailed information about the error to the user.

Here is an example of how you might use componentDidCatch to log an error to an error reporting service:

There are a few important points to keep in mind when working with the componentDidCatch method:

componentDidCatch is only called if an error is thrown in the component itself, or in one of its children. It will not be called for errors thrown in other parts of the application.
componentDidCatch is called after an error is thrown, but before the component's updates are made to the DOM. This means that you can use it to handle the error and display a fallback UI, but you cannot use it to prevent the error from being thrown.
Called for runtime errors, not for syntax errors or other types of compilation errors.
Called for the closest ancestor component that implements it. If a parent component has a componentDidCatch method, it will be called instead of the componentDidCatch method of a child component.
Called only once per error, regardless of how many components are affected by the error.

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Seção 2. Capítulo 6

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