radionovich

interface Walker {
  walk(): void;
}

interface Swimmer {
  swim(): void;
}

interface Flyer {
  fly(): void;

radionovich

interface Animal {
  fly(): void;
  walk(): void;
  swim(): void;
}

class Dog implements Animal {
  
  public fly(): void {
    // a dog can't fly

radionovich

class Player {

  public kickBallWithFeet(): void {
    console.log("Kicking the ball with feet!")
  }
}

class HandsUsingPlayer extends Player {
  public holdBallWithHands(): void {
    console.log("Holding the ball with hands!")

radionovich

class Player {

  public kickBallWithFeet(): void {
    console.log("Kicking the ball with feet!")
  }

  public holdBallWithHands(): void {
    console.log("Holding the ball with hands!")
  }
}

radionovich

interface Player {
  calculateGameRating(): number;
}


class Midfielder implements Player {
  public assists: number;
  public goals: number;

  constructor(assists: number, goals: number) {

radionovich

class Midfielder {
  public assists: number;
  public goals: number;

  constructor(assists: number, goals: number) {
    this.assists = assists;
    this.goals = goals;
  }
}

radionovich

class Patient {
  public firstName: string;
  public lastName: string;
  public email: string;
  public age: number;
}

class ReportGenerator {
  public saveToPdf(patient: Patient): void {
    // here is code to generate PDF report for patient

radionovich

class Patient {
  public firstName: string;
  public lastName: string;
  public email: string;
  public age: number;

  public savePatientReport(): void {
    // here is code to generate PDF report for patient
  }
}

radionovich

interface IOcassion {
  accept(singer: ISinger): void;
}

interface ISinger {
  singChildrenSongs(ocassion: ChildBirthday): void;
  singWeddingSongs(ocassion: Wedding): void;
  singConcertSongs(ocassion: Concert): void;
}

radionovich

const applePie: ApplePie = new ApplePie();
const pumpkinPie: PumpkinPie = new PumpkinPie();

applePie.makeDough();
applePie.addPieIngredient();
applePie.bake();

pumpkinPie.makeDough();
pumpkinPie.addPieIngredient();
pumpkinPie.bake();