[🔷TS -- classes] #typescript

classes.ts

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes
// https://www.typescriptlang.org/docs/handbook/2/classes.html

class Foo {
  #privateFieldWithInitializer = 42;
  
  constructor(...args) {
    super(...args)
    this.code = "42"
  }
  
  method(id: AppId) { // not bound
    this.privateFieldWithInitializer = id
  }

  readonly method = (id: AppId) { // bound!
    this.privateFieldWithInitializer = id
  }
  
  static #privateStaticField;
  static #privateStaticFieldWithInitializer = 42;

  static #privateStaticMethod() {
    // …
  }
  static {
    // Class Static Initialization Blocks https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes/Static_initialization_blocks
    this.staticProperty2 = 'Property 2';
  }
}

class Foo {
  constructor(private readonly privateField: bar) {} // equivalent to declaring + initializing a private field
}

// implements, extends

// https://www.typescriptlang.org/docs/handbook/classes.html
class Greeter {
  greeting: string;
 
  constructor(message: string) {
    this.greeting = message;
  }
 
  greet() {
    return "Hello, " + this.greeting;
  }
}
 
let greeter = new Greeter("world");