Using "Function as Children" in React

In React, we often pass static JSX or components as children to other components.

But what if children could be a function instead of plain JSX?

This is exactly what the Function as Children (or Render Props) pattern allows.

---

✅ What is Function as Children?

Normally, you'd pass JSX like this:

<Component>
  <div>Hello World</div>
</Component>

With function as children, you pass a function:

<Component>
  {(data) => <div>{data.message}</div>}
</Component>

Here, the child is a function that receives data (or any parameter) from the parent component!

---

✅ Why Use Function as Children?

• Flexibility:
  
  Components can offer dynamic control over their rendering.

• Reusability:
  
  You don't need to hard-code rendering logic inside the component itself.

• Composition:
  
  Share behavior without restricting the structure of the UI.

---

✅ Example

type DataProviderProps = {
  children: (data: { message: string }) => React.ReactNode;
};

const DataProvider = ({ children }: DataProviderProps) => {
  const data = { message: 'Hello from DataProvider!' };
  return <>{children(data)}</>;
};

// Usage
<DataProvider>
  {(data) => <h1>{data.message}</h1>}
</DataProvider>

Here, DataProvider controls what data is passed, but the consumer controls the UI!

---

✅ Real-world Use Cases

• Tooltips that need access to the anchor position
• Tables where rows are rendered dynamically
• List views with custom item templates
• Modals and portals
• Resizable panels or draggable elements

---

🚀 Key Takeaways

• Think of it as "children, but smarter."
• Use it when you want to give control back to the component user.
• Keep it simple: only use it when necessary to avoid overcomplicating your code.