Question from the React (legacy) test

We want to optimize this component by implementing shouldComponentUpdate:

class Comments extends React.Component{
    constructor(props){
        super(props);
    }
    
    shouldComponentUpdate(nextProps, nextState){/* MISSING CODE*/}
    
    render(){
        return(
           <div>
               {this.props.comments.map((comment, i)=><p key={i}>{comment}</p>)}
           </div>
        );
    }
}

Comments.propTypes={
    comments: PropTypes.arrayOf(PropTypes.string).isRequired
};

Check the valid optimization(s):

if(nextProps.comments.length!== this.props.comments.length){
  return true;
}
if(nextProps.comments.some((comment, i)=>comment!== this.props.comments[i])){
  return true;
}
return false;