Learn Modern Javascript From Ground Zero Chapter 9 Maps Sets Weak Collections

Summary

Object literals, key order, hasOwn, property descriptors, enumerability, and the right way to copy objects. In this video we will look at some of the new data structures. ES6 Introduced Optional chaining, nullish coalescing, destructuring and spread, and the == vs === question settled for good. Your cache leaks 500 megabytes in 2 seconds and crashes your production app. With WeakMap, it leaks Well-known symbols, Proxy and Reflect, the new using declaration for automatic cleanup, and how Watch this first: how every course here is built, and why it matches the way your brain Every form of import and export, live bindings, dynamic import(), import.meta, JSON modules, and ESM vs CommonJS. Building an app or preparing for a