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Choose the right approach
| What you need | React approach | What to keep in mind |
|---|---|---|
| Choose a visible UI variant already available in the app | Conditional rendering, optionally with a finite map of component references | Direct and simple, but the component code may already be in the bundle. React’s conditional-rendering guide explains the JavaScript branching options. |
| Render caller-provided JSX inside a reusable wrapper | children or another content prop |
The wrapper does not need to know which component or elements it receives. See Passing Props to a Component. |
| Defer downloading component code until it is rendered | lazy with Suspense |
Requires a loading fallback and support for dynamic imports in the bundler or framework. See React’s lazy reference. |
Choose among components already in the app
When a prop or state value determines which UI to show, use ordinary JavaScript conditions. For two alternatives, a ternary is concise:
function Results({ view }) {
return view === 'chart' ? <Chart /> : <Table />;
}For a longer branch, use if statements and return the chosen JSX. Use && when the false case should render nothing; make the left side a boolean condition so a non-boolean value is not accidentally exposed in the rendered output. React’s conditional-rendering guide covers if, &&, ternaries, and returning null.
Use a finite component map for several known choices
If the alternatives are known ahead of time, map their keys to imported component references, then render the selected reference with JSX:
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const views = {
chart: Chart,
table: Table,
};
function Results({ view }) {
const View = views[view] ?? Table;
return <View />;
}This is an application pattern built on React’s normal rendering model, not a special React API. Choose a deliberate fallback or validate the input when an unknown key is possible. A fixed map of imported references is different from trying to import arbitrary module paths supplied at runtime; React’s documentation does not guarantee that arbitrary names can be resolved by a build system.
Pass JSX into a reusable wrapper
If a card, panel, or shell should display content chosen by its caller, accept children and render it where it belongs. This keeps the wrapper independent of the nested UI:
function Panel({ children }) {
return <section className="panel">{children}</section>;
}
function Page() {
return (
<Panel>
<SettingsForm />
</Panel>
);
}Use a named prop instead when the supplied content has a specific role, such as header or footer. React describes component composition in its props guide and UI overview.
Load component code only when it is needed
Conditional rendering selects what to display; it does not by itself defer downloading a component’s code. For deferred loading, declare a lazy component at module scope and render it beneath a Suspense boundary:
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const SettingsPanel = lazy(() => import('./SettingsPanel.js'));
function App() {
return (
<Suspense fallback={<p>Loading settings…</p>}>
<SettingsPanel />
</Suspense>
);
}Check the export and declaration
- The imported module must provide the component as its
defaultexport. If it only has a named export, adapt the module or return an object with the component assigned todefaultfrom the import function. - Declare
lazy()outside component functions. Declaring it during rendering can reset component state when the parent rerenders. - Dynamic
import()must be supported by the bundler or framework in use.
Plan for loading and failure
The fallback is shown while the lazy component loads, so make it meaningful for the user and appropriate to the space it occupies. React caches the loading promise and its resolved value. If loading rejects, React throws the rejection so the nearest Error Boundary can handle it; add an Error Boundary if the interface needs a defined recovery experience. React documents these behaviors in the lazy reference; Built-in React Components lists Suspense.
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Common mistakes to avoid
- Using lazy loading just to switch views: use a condition or finite map when the alternatives are already available and code splitting is not the goal.
- Using a string as if it were a component: select a component reference from a known map, then render that reference as JSX.
- Declaring a lazy component inside a function component: move the declaration to module scope to avoid state resets on rerenders.
- Forgetting the loading boundary or expected export shape: provide a
Suspensefallback and ensure the imported module resolves to a default component.
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