JSX (JavaScript XML)

JSX, an abbreviation of JavaScript XML, is what we are discussing. It serves as a syntax extension. JavaScript XML finds applications alongside React written in JavaScript. This added extension allows for the crafting of code. It is possible to write code that resembles HTML in JavaScript files. This simplifies the process of creating user interfaces.

Important to note is that JSX differs from HTML. However, there is a likeness. JSX traces its origin to JavaScript. Underneath the facade, JSX transforms into JavaScript. Developers can interact with React components more effortlessly. It assists them in completing necessary tasks. This results in a smoother, more efficient output.

1. JSX Syntax

JSX lets us write code. It is similar to HTML. Yet it is handled as JavaScript. A basic JSX element mirrors an HTML tag.

<h1>Hello World!</h1>

In the above instance, <h1> is an example of JSX. It mirrors an HTML tag. But, it is essentially JavaScript. JSX creates elements. It does so with similar attributes to HTML.

Here is an example:

<div className="container"></div>

A crucial difference exists. We use className not class. This is vital as class is a JavaScript reserved term.

2. Inserting Expressions in JSX

Curly braces in JSX allow for placing JavaScript expressions. This is for integrating dynamic content in the UI. Let's explore an example.

<h1>Hello {name}</h1>

The example shows the name value embedded in JSX. The output should read: Hello John!.

Operations within JSX are also possible. You might be calling functions or using expressions. Here is another example:

<h1>{5 + 10}</h1>

Rendering this will produce 15. JSX empowers the construction of dynamic user interfaces profoundly.

3. JSX vs. HTML

Several crucial differences exist. Even though JSX is similar to HTML, it is not the same. Consider:

• Attributes: We use className in JSX. We avoid class. We use htmlFor. We avoid using for. Conflicts occur with JavaScript keywords.

Example of JSX:

<div className="container"></div>

<label htmlFor="name">Name:</label>

Self-closing tags: In JSX, all tags should be closed appropriately. We do not use <img> or <input> for HTML. These require a closing with a / in JSX. Here is an example:

<img src="image.jpg" />

JavaScript in JSX

In JSX, we can embed JavaScript logic. This improves its interactivity and dynamism. JSX unites JavaScript's power with code writing ease. This is much like you would write HTML. Initially, it might seem a bit confusing. Yet with enough practice, it starts to feel quite natural. This is the approach to writing React components that many are adopting.

User interface construction gets a boost. It now becomes speedier and more intuitive than before. JSX merges the familiar HTML structure with JavaScript logic.