React by Patrik

Understanding JSX

JSX may look like HTML, but it’s actually JavaScript. When used correctly, it brings power and clarity to React development.

Why Use JSX?

  • It’s familiar to anyone who has written HTML.
  • You can mix logic and layout using {} for JavaScript expressions.
  • JSX is compiled into fast and efficient React code.

Key JSX Rules

  • Use className instead of class.
  • Self-closing elements like <img />.
  • Wrap multiple elements in one parent: <div> or <>.

Example:

function Greeting() {
  return <h1>Hello, world!</h1>;
}

Common Mistakes

  • Forgetting to close tags.
  • Using class instead of className.
  • Returning multiple sibling elements without a wrapper.
jsx
react
syntax
javascript
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