Questions

11.1. Decorating methods, the future way. In Chapter 6, Producing Functions - Higher-Order Functions, we wrote a decorator to enable logging for any function. Currently, method decorators are being considered for upcoming versions of JavaScript: refer tohttps://tc39.github.io/proposal-decorators/ for that (Draft 2 means that inclusion of this feature in the standard is likely, although there may be some additions or small changes). Study the draft and take a look at what makes the next code tick.

Some questions: Do you see the need for the savedMethod variable? Why do we use function() when assigningnew descriptor.value, instead of an arrow function? Can you understand why .bind() is used? What is descriptor?

const logging = (target, name, descriptor) => {
    const savedMethod = descriptor.value;
    descriptor.value = function(...args) {
        console.log(`entering ${name}: ${args}`);
        try {
            const valueToReturn = savedMethod.bind(this)(...args);
       ...