How to Effectively Pass Props to `this.props.children` in React?

How to pass props to {this.props.children}

The intent of this question is to clarify the proper way to pass props to all children within a wrapper component that utilizes {this.props.children} for rendering.

Cloning Children with New Props

One approach involves the use of React.Children, which iterates over each child element and clones them with new props through React.cloneElement. However, this method is generally discouraged as it can lead to fragile code.

To illustrate, consider the following code:

const Child = ({ childName, sayHello }) => (
  <button onClick={() => sayHello(childName)}>{childName}</button>
);

function Parent({ children }) {
  // This `sayHello` function is passed down to child elements.
  function sayHello(childName) {
    console.log(`Hello from ${childName} the child`);
  }

  const childrenWithProps = React.Children.map(children, child => {
    // `React.isValidElement` ensures the child is a valid React element.
    if (React.isValidElement(child)) {
      return React.cloneElement(child, { sayHello });
    }
    return child;
  });

  return <div>{childrenWithProps}</div>;
}

While this approach allows for the passing of props to children, it is less type-safe and potentially confusing to read compared to the following alternative:

function Parent({ children }) {
  // This `sayHello` function is passed down to child elements.
  function sayHello(childName) {
    console.log(`Hello from ${childName} the child`);
  }

  // Directly passing props to children.
  return <div>{children(sayHello)}</div>;
}

This latter approach more explicitly conveys the intent to pass props to children and maintains type safety.

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