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?

useRef()

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

Course Content

React Tutorial

React Tutorial

useRef()

useRef is a hook in React that allows you to create a mutable reference to a value. It is a way to store a value that will not trigger a re-render when it changes.

Here's an example of how to use useRef:

In this example, the inputRef value is created using useRef and passed as the ref attribute to the input element. The focusInput function uses the current property of the inputRef to focus the input. Because the inputRef value is mutable, it can be updated without causing a re-render.

You can also use useRef to store mutable values other than DOM elements. For example, you might use it to store a timer ID or a WebSocket connection.

The value stored in the ref is mutable, but the reference itself is not. This means that if you update the value of the ref, it will not cause a re-render.

For example:

In this example, the countRef value is created using useRef and initialized to 0. The increment function increments the current property of the countRef, but this does not cause a re-render.

There are a few nuances to be aware of when using useRef:

The value stored in the ref is mutable, but the reference itself is not. This means that if you update the value of the ref, it will not cause a re-render.
The value of the ref will not change between renders, so it can be used as a way to preserve state across renders.
If you need to store a value that should trigger a re-render when it changes, consider using the useState hook instead.

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Section 3. Chapter 6

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