//ChildExt component
class ChildExt extends React.Component {
    render() {
        return (
 this.props.handleForUpdate('someNewVar')}>Push me
        )}
}
//Parent component
class ParentExt extends React.Component {
  constructor(props){
    super(props);
    this.state = {lol: false }
  }

    handleForUpdate(someArg){
            this.setState({lol: true});
              console.log(someArg);
    }
  //Notice how we don't pass the arguments into the bind.this even though it does take an argument.
    render() {
        return ()
    }
}