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.

useReducer()

React Router Dom

Course Content

React Tutorial

React Tutorial

useReducer()

useReducer is a hook in React that allows you to manage the state in a functional component. It is similar to useState, but is often used for managing state that is more complex or involves multiple sub-values.

Here is an example of how you might use useReducer in a React component:

In this example, the useReducer hook is called with a reducer function and an initial state. The hook returns an array with two values: the current state, and a dispatch function. The dispatch function is used to update the state by calling it with an action object that describes the type of action to take.

In this example, the reducer function takes the current state and an action object as arguments, and returns a new state based on the action type. The component renders a count and two buttons that increment or decrement the count by calling the dispatch function with the appropriate action type.

One of the main benefits of using useReducer is that it can help to make your code more predictable and easier to understand by separating the logic for updating state from the component itself. This can be especially useful when dealing with a complex state or state that depends on the previous state.

Note

The reducer function should be a pure function, meaning it should not have any side effects and should always return the same output for a given set of inputs.

The initial state should be an object that represents the full state of your component. If you need to set initial values for multiple sub-values within the state, you can do so by including those values in the initial state object.

The action object passed to the dispatch function should always have a type field that specifies the type of action to take. You can also include additional fields in the action object to pass along any data or payload that is needed by the reducer function.

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Section 4. Chapter 5

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