Typescript examples

decorator-1.ts

function SelfDriving(classFn: Function) {
  classFn.prototype.selfDrivable = true;
}

@SelfDriving
class SomeCar {
  private make: string;
  constructor(make: string) {
    this.make = make;
  }
}

decorator-2.ts

function Wheels(numberOfWheels: number) {
  return function(classFn: Function) {
    classFn.prototype.wheels = numberOfWheels;
  }
}

@Wheels(3)
class ExoticCar {
  private make: string;

  constructor(make: string) {
    this.make = make;
  }
}

generics-1.ts

export class MailSender<T> {
  send(mail: T) {
    console.log('Sending...', mail);
  }
}

const billing = new MailSender<CardBilling>();
billing.send(new CardBilling());

interface-animal.ts

interface IAnimal {
  name: string;
  sound: () => string;
  run: () => number;
}

class Dog implements IAnimal {
  name: string;

  constructor(name: string) {
    this.name = name;
  }

  run() {
    return 30;
  }

  sound() {
    return 'auau';
  }
}

typed-person.ts

type Person = {
  firstName: string;
  lastName: string;
  country: string;
};

function f(): Person {
  return {
    firstName: 'Samuel',
    lastName: 'Martins',
    country: 'Brasil',
  };
}