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Use children for flexible nested content; use named JSX props—often called slots—for a small, stable set of distinct content regions. If repeated items have metadata, use structured data; if callers must render using state or data your component supplies, use a render prop. Reserve a cloning Slot API for cases where the component must add props or behavior to a caller-provided element.
What “slots” means in React
In React component APIs, a slot usually means a JSX element passed through a named prop, such as left, header, or actions. React’s common-components documentation illustrates this with <Layout left={<Sidebar />} right={<Content />} />. That is different from the HTML slot attribute, which is associated with Shadow DOM. React: Common components
Choose the API that matches the component’s contract
Use children for open-ended composition
When a component has one main content area—or consumers should decide how nested pieces are arranged—children keeps the call site concise and composable:
<Card><Profile /><Activity /></Card>
React treats children as a React node, and JSX nesting usually supplies it implicitly. React: Children
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Use named JSX props for distinct regions
When a component has a small, stable set of places with different roles, named props make those roles explicit:
<Layout sidebar={<Sidebar />} content={<Article />} />
Names such as header, footer, leading, or actions communicate where content belongs without requiring the component to infer meaning from a nested tree. Document the intended role and what each prop accepts.
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Use structured data for repeated items with metadata
If repeated content carries IDs, labels, or other information that affects behavior, represent it as data rather than relying on child order or inspecting child elements. React’s Children reference demonstrates a tabs array containing IDs, headers, and content. With data, the component can use ordinary array operations and keep each item’s metadata associated with its content. React: Children
Use a render prop when callers need component-supplied state or data
If the component owns data or state that the caller needs in order to produce UI, a function prop can pass that information to the caller’s rendering logic. React documents patterns such as renderContent and renderRow; these are ordinary function props that return UI. React: Children
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Use a cloning Slot API to enhance a caller’s element
A cloning Slot solves a different problem from reserving a content region: it lets a component add its props or behavior to an element supplied by the caller. Radix’s asChild option suppresses the primitive’s default DOM element, clones the supplied child, and passes required props and behavior to it. Choose this pattern when element composition is part of the component’s behavior, not merely to accept content. Radix Primitives: Composition
What to consider before inspecting or cloning children
Children are opaque
Do not assume children is an array or depend on its internal representation. If you truly need to count, map, or convert children, use React’s documented Children helpers rather than inspecting the structure directly. Even those helpers operate on the children passed to the component, not on the rendered output inside a nested component: a parent sees <MoreRows /> as one child and cannot inspect the elements MoreRows later renders. React: Children
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React cautions that “Manipulating children with the Children methods often leads to fragile code.” When child-tree manipulation seems necessary, consider named props, exported subcomponents, structured data, or a render prop instead. React: Children
Cloning makes the caller’s element part of the contract
With a cloning API such as Radix asChild, a custom child component must spread the props it receives onto its underlying DOM node. The primitive may also need to attach a ref, so the child must support refs as required by that primitive. The resulting element must remain functional and accessible: substituting a non-focusable div for a button trigger, for example, can break keyboard interaction and accessibility. Check the specific primitive’s contract and the React/Radix versions used by your project; the cited documentation passages do not specify a particular release. Radix Primitives: Composition
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A quick decision guide
- One flexible body, with consumers arranging its contents: use
children. - A few distinct, stable places such as header and actions: use named JSX props.
- Repeated entries with IDs, labels, or other metadata: use a data array.
- Caller-generated UI based on state or data from your component: use a render prop.
- Props, handlers, or a ref must be applied to the caller’s element: consider a cloning Slot API, with its prop, ref, and accessibility requirements made explicit.
These are API-design choices, not a rule that one pattern is always best. Prefer the simplest contract that expresses what the component accepts and what it does with that content.
Quick Recap
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