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I would like to know the reason why is this feature in TypeScript called Decorator?
Is it just a different name from Annotation or Attribute? Is there any other reason?
What is the difference between a Decorator and an Annotation/Attribute?
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Decorators provide a way to add both annotations and a meta-programming syntax for class declarations and members. Decorators are a stage 2 proposal for JavaScript and are available as an experimental feature of TypeScript. NOTE Decorators are an experimental feature that may change in future releases.
Annotations are only metadata set on the class using the Reflect Metadata library. Decorator corresponds to a function that is called on the class. Annotations are used for creating an attribute annotations that stores array. Decorator is a function that gets the object that needs to be decorated.
Decorators provide a way to annotate or modify a class or class member in TypeScript. However, Decorators are still an experimental feature of the language.
Decorators are a new feature of TypeScript and used throughout the Angular code, but they are nothing to be scared of. With decorators we can configure and customise our classes at design time. They are just functions that can be used to add meta-data, properties or functions to the thing they are attached to.
It's because they do different things.
An annotation adds metadata to a piece of code that can later be read and used by other code. While a decoration decorates some code with some other code.
Take the case of logging.
A logging annotation can be retrieved at runtime by the logger (maybe via reflection) and logging will be generated according to it.
A logging decoration will surround the logged code with a function that logs information.
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