React

Now that your React development environment is ready, it is time to build your first React application. React applications are built by combining small, reusable pieces of user interface called components. Instead of creating one large file containing an entire application’s interface, React allows you to divide the interface into smaller components and combine them … Read more

JSX attributes are used to provide additional information to HTML elements and React components. They allow you to control how an element behaves, looks, and receives data. If you already understand HTML attributes such as class, id, src, href, and alt, JSX attributes will feel familiar. However, JSX follows JavaScript and React conventions, so some … Read more

React allows you to use JavaScript expressions directly inside JSX to decide what should appear on the screen. These expressions are one of the most important parts of React because they allow your UI to display dynamic values instead of only static HTML. For example, instead of writing: you can store the name in a … Read more

React allows you to conditionally display elements using JavaScript’s logical AND operator, written as &&. This technique is commonly called logical AND rendering or conditional rendering with &&. It is useful when you want to display something only when a condition is true. For example: When isLoggedIn is true, React renders: When isLoggedIn is false, … Read more

The ternary operator is a JavaScript operator that allows you to choose between two values based on a condition. It is especially useful in React because JSX allows JavaScript expressions inside curly braces. For example: If isLoggedIn is true, React renders: If it is false, React renders: The ternary operator is one of the most … Read more

React applications rarely display the same content all the time. A user might be logged in or logged out. A product might be available or sold out. A page might be loading data, showing an error, or displaying the actual content. React allows you to display different UI based on these conditions. This is called … Read more

When creating React components, you will often need to return multiple elements together. For example, you may want a component to return: However, a React component must return a single parent structure. A common solution is to wrap the elements inside a <div>: This works, but sometimes you do not actually need that extra <div> … Read more

React allows you to apply CSS directly to JSX elements using the style attribute. This is commonly called inline styling. In regular HTML, inline CSS is written as a string: In JSX, the style attribute works differently. Instead of passing a CSS string, React expects a JavaScript object containing CSS properties and their values. At … Read more

When working with JSX, you will frequently need to apply CSS classes to elements. In regular HTML, you use the class attribute for this purpose. For example: In JSX, you use className instead: className is one of the most commonly used JSX attributes because it connects your React components with CSS. Understanding className is important … Read more

Comments are used in JavaScript to explain code, leave notes for developers, or temporarily disable code. Because JSX is written inside JavaScript, comments in JSX use a slightly different syntax from ordinary HTML comments. For example, this is a JSX comment: The comment is placed inside curly braces because JSX uses JavaScript expressions within {}. … Read more

Arrays are used in React whenever you need to work with a collection of values. A React application may need to display a list of products, users, courses, messages, posts, menu items, or search results. Instead of creating separate JSX elements for every item, you can store the data in an array and use JavaScript … Read more

Objects are one of the most useful JavaScript data structures when working with React. A JavaScript object allows you to store related information together using key-value pairs. In React, objects are commonly used for users, products, settings, API responses, configuration data, and component props. For example: You can then access the object’s values inside JSX: … Read more

Functions are an important part of JavaScript and React. They allow you to organize logic into reusable blocks of code and are used throughout React applications. When working with JSX, functions can be used to calculate values, format data, return JSX, handle events, and perform other tasks needed by a component. For example: The getGreeting() … Read more

Variables are one of the simplest and most important ways to make a React interface dynamic. In JSX, you can create JavaScript variables inside a component and then use those variables to display text, numbers, attributes, styles, and other values in the UI. For example: The variable name contains “John”, and {name} tells JSX to … Read more

One of the main reasons JSX is so powerful is that it allows JavaScript to work directly with the UI. JSX looks like HTML, but it is written inside JavaScript. Because of this, you can use JavaScript values, calculations, object properties, function calls, conditions, and array methods while creating your React interface. For example: Here, … Read more

One of the most useful features of JSX is the ability to use JavaScript expressions directly inside your UI. JSX allows you to combine markup-like syntax with JavaScript values, calculations, function calls, object properties, conditions, and other expressions. This makes React interfaces dynamic instead of limited to static content. For example: Here, {name} is a … Read more

JSX looks similar to HTML, but it follows a set of rules that are important when writing React components. These rules make JSX compatible with JavaScript and allow React to correctly understand the UI structure you want to create. Understanding these rules early will help you avoid common errors and write cleaner React code. JSX … Read more

JSX syntax is the foundation for describing user interfaces inside React components. If you have already learned what JSX is and how it differs from HTML, the next step is understanding how to correctly write JSX and how its syntax works inside a React application. JSX looks familiar because many of its elements resemble HTML. … Read more

JSX is one of the most important concepts you will learn when working with React. It allows you to write HTML-like markup directly inside JavaScript code, making it much easier to describe what a React component should display. At first, JSX may look unusual because it combines JavaScript with syntax that resembles HTML. However, JSX … Read more