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

Challenge

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

Challenge

Task

GIven a React component that displays a list of items. The component should have two lifecycle methods: componentDidMount and componentDidUpdate.

In the componentDidMount method, you should fetch a list of items from a server and update the component's state with the new list of items. In the componentDidUpdate method, you should check if a new item has been added to the list of items. If a new item has been added, you should fetch the updated list of items from the server and update the component's state with the new list.

Your tasks are as follows:

Initialize the empty array of items in the state variable.
Implement a componentDidMount function calling the fetchItems method.
Write two conditions, one that checks whether the item is in the array using includes and the other using the find method.
Set the state variable items in the fetchData method.
Add a list item looping over the items.

Hints:

ComponentDidMount has no params, just calls the method this.fetchItems.
Match the newItem in includes and for find check whether item.name matches or not.
Remember to add the key to the list item as item.id along with the name.

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