Class Decorators

Class decorators are used to modify the class definition. They can be used to add properties, methods, or static properties to the class.

@myDecorator(param)
class MyClass {
  // class definition
}

1. Class

To be object-oriented and manipulate objects, you must first have objects. The next question is how to create objects. To create an object, you must first define a class. A class can be understood as a model of an object. In the program, you can create specified types of objects based on the class. For example, you can create a person's object through the Person class, a dog's object through the Dog class, and a car's object through the Car class. Different classes can be used to create different objects.

0. Introduction to TypeScript

1. TypeScript is a superset of JavaScript.
2. It extends JS by introducing the concept of types and adding many new features.
3. TS code needs to be compiled into JS by a compiler before being executed by a JS parser.
4. TS is fully compatible with JS; in other words, any JS code can be used as JS directly.
5. Compared to JS, TS has static types, stricter syntax, and more powerful features; TS can perform code checks before execution, reducing the likelihood of runtime exceptions; TS code can be compiled into any version of JS code, effectively solving compatibility issues across different JS runtime environments; for the same functionality, TS code tends to be larger than JS, but due to TS's clearer code structure and more explicit variable types, TS is far superior to JS in later code maintenance.