Show different UI based on conditions.
✍️ 3 exercises + code challenge in this lessonUse normal JavaScript to decide what to render:
if statements before the return.{isLoggedIn ? <Logout /> : <Login />}&& to render something only when true: {count > 0 && <Badge />}&& and numbers: {0 && <X />} renders "0". Use count > 0 && ....Mastering React Conditional Rendering helps you write clean and reliable React code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
<div id="root"></div>
<script src="https://unpkg.com/react@18.3.1/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@18.3.1/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/@babel/standalone@7.25.6/babel.min.js"></script>
<script type="text/babel">
const { useState, useEffect, useRef, useMemo, createContext, useContext } = React;
function Status({ stock }) {
if (stock === 0) return <span style={{ color: "#DC2626" }}>Out of stock</span>;
return <span style={{ color: "#16A34A" }}>{stock < 5 ? `Only ${stock} left!` : "In stock"}</span>;
}
function App() {
const loggedIn = true;
const unread = 3;
return (
<div>
<p>{loggedIn ? "Welcome back!" : "Please sign in."}</p>
{unread > 0 && <p>📬 You have {unread} new messages</p>}
<p>Laptop: <Status stock={0} /></p>
<p>Mouse: <Status stock={3} /></p>
<p>Keyboard: <Status stock={40} /></p>
</div>
);
}
ReactDOM.createRoot(document.getElementById("root")).render(<App />);
</script>Check what you learned in “React Conditional Rendering”.
Render the badge only when count is greater than 0.
{count > 0 <Badge />}
What does {0 && <X />} render?
Render "Welcome back!" in a <p> when loggedIn is true, otherwise "Please sign in.".
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