react.isvalidelement code example

Example 1: react memo

function MyComponent(props) {
  /* render using props */
}
function areEqual(prevProps, nextProps) {
  /*
  return true if passing nextProps to render would return
  the same result as passing prevProps to render,
  otherwise return false
  */
}
export default React.memo(MyComponent, areEqual);

Example 2: React Children map example

export default class SomeComponent extends React.Component {
  render() {
    const childrenWithWrapperDiv = React.Children.map(this.props.children, child => {
      return (
        <div className="some-component-special-class">{child}</div> 
      );
    });

    return (
      <div className="some-component">
        <p>This component has {React.Children.count(this.props.children)} children.</p>
        {childrenWithWrapperDiv}        
      </div>      
    );
  }
}