Object Method ES5

script.js

//define Book as an object constructor function
function Book(name,author) {
  this.name = name;
  this.author = author;
}
//add getBookDetails method to object prototype
Book.prototype.getBookDetails = function (){
  return `The book ${this.name} was written by ${this.author}`;
}

//add some new books
const jspatterns      = new Book('JavaScript Patterns','Stoyan Stefanov');
const masteringnodejs = new Book ('Mastering Node.js','Sandro Pasquali');

//call getBookDetails method on each defined book
jspatterns.getBookDetails();// "The book JavaScript Patterns was written by Stoyan Stefanov"
masteringnodejs.getBookDetails();// "The book Mastering Node.js was written by Sandro Pasquali"