# Understanding Conditional Rendering in React (2025 Guide) Conditional rendering is a **fundamental concept in React** that allows components to display different elements based on a given condition. Think of it as React’s way of saying: *“If this condition is true, render this; otherwise, render something else.”* --- ## Logical AND (`&&`) Operator The logical AND operator is useful when you want to render something **only if a condition is true**. ```jsx function Greeting({ isLoggedIn }) { return (

Welcome to React!

{isLoggedIn &&

You are logged in.

}

); } ``` - If `isLoggedIn` is `true`, React will render the `

` element. - If `isLoggedIn` is `false`, nothing is rendered. ⚠️ **Tip:** Be careful when using numbers with `&&`. For example, `0 &&

Text

` will render `0`, which may not be what you expect. ➡️ *Suggested image:* `/images/react-conditional-rendering-and-example.png` (screenshot of code + output). --- ## Ternary Operator (`condition ? trueCase : falseCase`) The ternary operator is best when you want to choose **between two options**. ```jsx function UserStatus({ isLoggedIn }) { return (

{isLoggedIn ?

Welcome back!

Please log in.

}

); } ``` - If `isLoggedIn` is `true`, “Welcome back!” will render. - Otherwise, “Please log in.” will render. 👉 **Best practice:** Use ternaries for **two cases only**. If you find yourself nesting multiple ternaries, switch to `if...else` or `switch` for readability. ➡️ *Suggested image:* `/images/react-conditional-rendering-ternary-example.png` (side-by-side ternary code and output). --- ## `if...else` and `switch` For more complex conditions, handle logic **before the `return` statement** in your component: ```jsx function AccessLevel({ role }) { let message; if (role === "admin") { message = "You have full access."; } else if (role === "editor") { message = "You can edit content."; } else { message = "View-only access."; } return

{message}

; } ``` Or with `switch`: ```jsx function AccessLevel({ role }) { switch (role) { case "admin": return

You have full access.

; case "editor": return

You can edit content.

; default: return

View-only access.

; } } ``` ➡️ *Suggested image:* `/images/react-conditional-rendering-if-switch.png` (flow diagram showing branching logic). --- ## Modern Alternatives (2025+) With React 18 and beyond: - Use **early returns** to simplify conditional rendering. - Combine with **optional chaining (`?.`)** to safely access deeply nested properties. - Leverage **component composition** to avoid deeply nested conditions. Example with early return: ```jsx function Profile({ user }) { if (!user) { return

; } return

{user.name}

; } ``` ➡️ *Suggested image:* `/images/react-conditional-rendering-early-return.png` (screenshot of simple code + "Loading..." UI). --- ## Conclusion Conditional rendering is a cornerstone of React development. - Use `&&` for simple one-way checks. - Use **ternary** for two options. - Use **if/else** or `switch` for more complex scenarios. By keeping conditions clean and readable, your React components stay easy to understand and maintain. 🚀 ---

#conditional-rendering

فهم العرض الشرطي في React (دليل 2025)