Render Props

Render props is a pattern in React for sharing code between components using a function prop that returns UI elements. It enables components to delegate part of their rendering to another function, making it easier to share logic like fetching data, managing state, or handling events across multiple UI patterns.

At its core, a render prop is simply a function passed as a prop:

<MyComponent render={(data) => <div>{data}</div>} />

The component receiving this render prop can call it and pass it whatever context or state it wants to expose, allowing for highly flexible and reusable components.

One classic use case is with components that manage complex behavior but need to remain agnostic of how the UI is structured. For instance, a MouseTracker component might track the mouse position but leave it up to the consumer to decide how to display it:

<MouseTracker render={({ x, y }) => (
  <p>The mouse is at ({x}, {y})</p>
)} />

While this pattern has been somewhat superseded by hooks in modern React development, it remains useful in certain contexts and is foundational for understanding advanced component design. Render props encourage separation of concerns, promote code reuse, and enhance composability, which are all core principles in building scalable React applications.

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