How to Use Decorators in JavaScript

  1. We will learn what decorators are?
  2. Why do we use decorators?
  3. What are targets, names, and descriptors in decorators?
  4. We will write our own custom @TryCatch decorator

What are Decorators?

In a layman’s term, decorators are a piece of code that wraps with another functional composition or higher-order functions — literally ‘decorating’ it. This is a very basic higher-order function. CustomHigherOrderFunction takes a function as an argument and returns a wrapper of that function, which will append a decorator string in front of the passed string (hello world). So the output of the following function will be “​Decorator hello world.”

Why do we use decorators?

The decorator makes use of another function to poop out code. There is no need for any fancy decorators here! However, the entry of ES2015 Classes is a little strange. To wrap a class, and class Member decorators in KJavaScript seems like a very cool choice!

Decorating a Class Method

For using decorator in javascript, we will have two types of syntax

  1. @decoratorName
  2. @decoratorName(arguments)
  1. Target: The Object in which you’re doing some decorating. Here it is your Class
  2. Name: The name string you’re decorating.
  3. Descriptor: An object to the decorated method through the value property.

Wrapping Up

In case if you are looking for skilled JavaScript developers, to implement many of such out-of-the-box functionalities, then hire the best JavaScript developers from us. We have top-tier JavaScript developers, who have in-depth knowledge and top-of-the-line expertise in services all the shapes and sizes of clients. I hope your purpose of landing on this blog post has been served. In case of doubt or question, feel free to get in touch in the comments section below. We are open to learning more about the same from you and your experiences.



Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store