javascript 保存自https://classroom.udacity.com/nanodegrees/nd001/parts/4942f4d7-a48d-4794-9eb0-404b3ed3

Posted 2021-05-03

const book1 = { title: 'Pride and Prejudice', author: 'Jane Austen' };
const book2 = { title: 'The Catcher in the Rye', author: 'J.D. Salinger' };
const book3 = { title: 'Gulliver’s Travels', author: 'Jonathan Swift' };

const library = new WeakMap();
library.set(book1, true);
library.set(book2, false);
library.set(book3, true);

console.log(library);