React JS book prop using ES6 classes

_bookpropclass.js

import React from 'react';  // super class

class Book extends React.Component{  // sub class extends super class

    constructor (){  // all classes have a constructor method
        super(props);  // must do this to link sub class to super class properties
        this.id = "#B00K123";
        this.title = "We All Don't Know JS";
        this.description = "The book everyone needs to read";
        this.price = 0;
    }
    render (){  // a render method for the class. 
        return (
            return (
                <div key={book.id}>
                    <h2>{book.title}</h2>
                    <p>{book.description}</p>
                    <p><strong>{book.price}</strong></p>
                </div>
            )
        );
    }
  
    yadaYada (){ // all class methods are declared in the class: compact yada
      return 'Yada Yada!';
    }
}