How do you implement conditional rendering in React?

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In React, conditional rendering means displaying different UI elements based on certain conditions (like user input, state, or props). It’s similar to using if-else statements in JavaScript, but applied inside JSX.

Here are the common ways to implement it:

1. Using if/else Statements

You can use plain JavaScript conditions to decide what to return:

function Greeting({ isLoggedIn }) {
  if (isLoggedIn) {
    return <h1>Welcome back!</h1>;
  }
  return <h1>Please log in.</h1>;
}

2. Using Ternary Operator (condition ? true : false)

Great for inline rendering:

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

3. Using Logical AND (&&)

Best when you only want to render something if the condition is true:

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

4. Using Switch Statements

Useful for multiple conditions:

function Status({ status }) {
  switch (status) {
    case "loading":
      return <p>Loading...</p>;
    case "success":
      return <p>Data loaded successfully!</p>;
    case "error":
      return <p>Something went wrong.</p>;
    default:
      return <p>Idle...</p>;
  }
}

5. Using Immediately Invoked Functions in JSX

Sometimes helpful for more complex conditions:

function Greeting({ role }) {
  return (
    <div>
      {(() => {
        if (role === "admin") return <h1>Welcome Admin</h1>;
        if (role === "user") return <h1>Welcome User</h1>;
        return <h1>Welcome Guest</h1>;
      })()}
    </div>
  );
}

✅ In summary:

• Use if/else for clarity.

• Use ternary for inline conditional UI.

• Use && for rendering something only when the condition is true.

• Use switch or functions for multiple conditions.

Read More :

Explain the concept of Virtual DOM in React.

What are controlled and uncontrolled components in React?

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