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React is a JavaScript library for building user interfaces. React is used to build single-page applications. React allows us to create reusable UI components. Start learning React now
React, sometimes referred to as a frontend JavaScript framework, is a JavaScript library created by Facebook. React is a tool for building UI components. How does React Work?
Setting up a React Environment. If you have npx and Node.js installed, you can create a React application by using create-react-app.
When creating a React component, the component's name MUST start with an upper case letter. Class Component. A class component must include the extends React.Component statement. This statement creates an inheritance to React.Component, and gives your component access to React.Component's functions.
React Context. React Context is a way to manage state globally. It can be used together with the useState Hook to share state between deeply nested components more easily than with useState alone.
React is a JavaScript library created by Facebook. React is a User Interface (UI) library. React is a tool for building UI components
Create React App doesn't include page routing. React Router is the most popular solution.
React supports if statements, but not inside JSX. To be able to use conditional statements in JSX, you should put the if statements outside of the JSX, or you could use a ternary expression instead: Option 1: Write if statements outside of the JSX code:
Hooks allow function components to have access to state and other React features. Because of this, class components are generally no longer needed. Although Hooks generally replace class components, there are no plans to remove classes from React.
Note: In JSX, JavaScript expressions are written inside curly braces, and since JavaScript objects also use curly braces, the styling in the example above is written inside two sets of curly braces {{}}.
