trump flowtype

trump.js

// @flow

type Color = 'red' | 'black';
const RED = 'red';
const BLACK = 'black';

type Mark = {|name: string, color: Color|};
const SPADE: Mark = {name: 'S', color: BLACK};
const HEART: Mark = {name: 'H', color: RED};
const CLUB: Mark = {name: 'C', color: BLACK};
const DIAMOND: Mark = {name: 'D', color: RED};

type TrumpNumber = 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13;

class Card {
  number: TrumpNumber;
  mark: Mark;
  constructor(number: TrumpNumber, mark: Mark) {
    this.number = number;
    this.mark = mark;
  }

  color(): Color {
    return this.mark.color;
  }

  toString(): string {
    const converter = {'1': 'A', '11': 'J', '12': 'Q', '13': 'K'};
    const numberStr: string = converter[this.number] || this.number.toString();
    return `a Card(${this.mark.name}, ${numberStr})`;
  }

  isEqualMark(card: Card): boolean {
    return this.mark === card.mark;
  }

  isLargerThan(card: Card): boolean {
    if (this.number === 1 && card.number === 13) {
      return true;
    }
    if (this.number === 13 && card.number === 1) {
      return false;
    }
    return this.number > card.number;
  }
}

const card1 = new Card(1, SPADE);
const card2 = new Card(2, DIAMOND);
const card3 = new Card(13, SPADE);

console.log(card1.toString());
console.log(card2.toString());
console.log(card3.toString());
console.log(card1.isEqualMark(card2));
console.log(card1.isEqualMark(card3));
console.log(card1.isLargerThan(card2));
console.log(card1.isLargerThan(card3));