Angular UI Development with PrimeNG

Decorators

Decorators were proposed in ECMAScript 2016 (https://github.com/wycats/javascript-decorators). They are similar to Java annotations--they also add metadata to class declaration, method, property, and the function's parameter, but they are more powerful. They add new behaviors to their targets. With decorators, we can run arbitrary code before, after, or around the target execution, like in aspect-oriented programming, or even replace the target with a new definition. In TypeScript, you can decorate constructors, methods, properties, and parameters. Every decorator begins with the @ character followed by the name of the decorator.

How does it work under the hood that takes its target as argument? Let's implement a classic example ...