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.

Consumer

React Router Dom

Conteúdo do Curso

React Tutorial

React Tutorial

Consumer

In the React Context API, the Consumer component is used to consume the context value that was provided by the Provider component. It works by rendering its children as a function and passing the context value as an argument. This allows you to access the context value from anywhere within the component tree, without having to pass it down through props.

Here's an example of how you can use the React Context API to manage the authenticated state of a user in a login system:

In this example, the LoginButton component is able to consume the authenticated and login/logout functions from the AuthContext without having to pass them down as props. It does this by wrapping its JSX in an AuthContext. Consumer component and rendering its children as a function that receives the context value as an argument.

The AuthProvider component is responsible for providing the authenticated state and login/logout functions to the component tree. It does this by wrapping the component tree in an AuthContext.Provider component and passing the values as the value prop.

Following are some nuances to keep in mind when writing Consumer components:

Should only be used to access the context value that it is consuming. It should not be used to access other context values or state values.
Not to be used to make updates to the context value. If you need to update the context value, you should use the Provider component to do so.
The Consumer component should not be used to wrap the root element of the app. It should only be used within the component tree to access the context value.
The Consumer component should be used sparingly, as it can make the code harder to read and understand if used excessively. It's generally best to use the Consumer component only when you need to access the context value from a deeply nested component that would otherwise require a lot of prop drilling.

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Seção 4. Capítulo 2

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