Conditional rendering

What this means

Conditional rendering means choosing UI based on a condition. You can use if, &&, or the ternary operator to decide what appears.

In beginner terms, this topic answers one practical question: "What should I write, and why does React care about it?" Do not try to memorize the syntax first. First understand the idea, then connect the syntax to that idea.

Why it matters

Apps constantly make choices: logged in or logged out, loading or ready, empty or full, success or error.

When you build real React screens, this idea helps you decide where data should live, what the user should see, and what should happen after an interaction. That is why this lesson is part of the main path instead of being an optional detail.

Step by step

1. Notice the UI problem this topic solves. 2. Look at the smallest possible example. 3. Change one value and predict what should appear. 4. Run the example and compare the result with your prediction. 5. Use the practice task before moving on.

Small example

{isLoggedIn ? <Dashboard /> : <LoginPrompt />}

Common mistake

Do not hide important states. Loading, empty, and error states should be visible and clear.

Practice task

Show Welcome back when isLoggedIn is true and Please log in when false.

Remember this

UI should honestly reflect the current state.