In React, inline conditional expressions allow you to render different UI elements or components based on certain conditions without needing a separate function or block of logic. This keeps your JSX clean and concise.

Here are the most common ways to use inline conditionals:

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1. Using the Ternary Operator (condition ? true : false)

The ternary operator is the most popular method for inline conditionals.

function Greeting({ isLoggedIn }) {
  return (
    <div>
      {isLoggedIn ? <h1>Welcome back!</h1> : <h1>Please sign in.</h1>}
    </div>
  );
}

• If isLoggedIn is true, it renders "Welcome back!".
• If false, it renders "Please sign in."

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2. Using Logical AND (&&) Operator

If you only want to render something when a condition is true, you can use &&.

function Notification({ hasMessage }) {
  return (
    <div>
      {hasMessage && <p>You have new messages!</p>}
    </div>
  );
}

• If hasMessage is true, it shows the paragraph.
• If false, it renders nothing.

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3. Using Logical OR (||) Operator

You can use || when you want to render a fallback if a condition is false.

function DefaultUser({ username }) {
  return (
    <div>
      <h2>{username || "Guest"}</h2>
    </div>
  );
}

• If username is a truthy value, it shows the username.
• If username is falsy (e.g., null, undefined, ""), it displays "Guest".

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Best Practices:

• Keep it simple: If the logic becomes too complex, consider extracting it into a separate function or variable.
• Be cautious with falsy values: When using &&, remember that values like 0, "", and null are falsy and could cause unexpected behavior.

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In short:
Inline conditional expressions in React let you dynamically render elements based on conditions, making your components more flexible and readable.

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