Conditional Rendering: Show UI Based on State
Source: react.devintermediate
React uses plain JavaScript to decide what UI to show, which is essential for displaying loading states, errors, or user-specific content. The footgun: `count && <Component />` will render a "0" if `count` is 0, not nothing.
Think of conditional rendering as using JavaScript's `if/else` to return different JSX based on props or state. It's how you show a loading spinner, an error message, or a user-specific dashboard. A common footgun: `count && <Component />` will render a '0' if `count` is 0. Always use a boolean expression like `count > 0` to avoid rendering unwanted values.
Read the original → react.dev
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