function Blog(props) {
  const sidebar = (    

      {props.posts.map((post) =>
        
          {post.title}
        
      )}
    
  );
  const content = props.posts.map((post) =>    
      
{post.title}
      
{post.content}
    
  );
  return (
    

      {sidebar}      

      {content}    
  );
}

const posts = [
  {id: 1, title: 'Hello World', content: 'Welcome to learning React!'},
  {id: 2, title: 'Installation', content: 'You can install React from npm.'}
];
ReactDOM.render(
  ,
  document.getElementById('root')
);