[React](/courses/reactjs) supports several conditional rendering patterns, and the best choice depends on the shape of the condition rather than one pattern being universally better. ### Use Logical AND for Optional UI When the false case should render nothing: ```jsx {isAdmin && } ``` Mental model: ```text true → show something false → show nothing ``` Good examples include: ```text Error message Notification badge Admin action Optional help text ``` ### Use a Ternary for Two Alternatives When both conditions have UI: ```jsx {isLoggedIn ? ( ) : ( )} ``` Mental model: ```text true → UI A false → UI B ``` ### Use Early Returns for Major Component States ```jsx if (loading) { return ; } if (error) { return ; } if (!data) { return ; } return ; ``` This works particularly well when several states determine the entire component output. ### Use if Statements for More Complex Logic Sometimes a condition needs more than a short [JSX](/courses/reactjs) expression: ```jsx let content; if (user.role === "admin") { content = ; } else if (user.role === "editor") { content = ; } else { content = ; } return

{content}

; ``` ### Practical Decision Guide ```text Show something or nothing? → && Choose between two small alternatives? → ternary Several major component states? → early returns More complex branching logic? → if / else or extracted logic ``` ### Prioritize Readability This: ```jsx {a ? b ? : d ? : : } ``` may technically work, but it forces readers to decode the condition. A few additional lines of clear [JavaScript](/courses/javascript) are often better than extremely compact JSX. ### Interview-Ready Answer Use logical AND when a component should appear only for the true case, a ternary when choosing between two alternatives, early returns for major states such as loading or errors, and normal `if` statements for more complex branching. The best conditional-rendering technique is usually the one that makes the component's logic easiest to understand.