Understanding JavaScript decorators

Decorators in JavaScript are a design pattern used to extend the functionality of code by wrapping one piece of code with another, enhancing it without modifying the original function. This concept is facilitated by JavaScript's first-class functions and is already present in the form of higher-order functions, which take a function as an argument or return a new one. The TC39 proposal aims to simplify the use of decorators with classes by introducing a special syntax that allows the decoration of classes and their members, which is currently in Stage 2 of development. This new implementation supports classes and public, private, and static class members, offering a cleaner approach than higher-order functions. Although decorators are not yet officially part of JavaScript, they are widely used in the community, especially in Angular and TypeScript, and can be tried out using Babel. Decorators help write cleaner, more maintainable, and less complex code by providing a streamlined method to add features across multiple functions and classes, promoting code reusability and reducing complexity.