poker.js

// Goofing off with JS to learn about map, filter, and reduce

// A deck of cards has 4 suits and 13 ranks
const suits = ['s', 'd', 'c', 'h']
const ranks = ['A', 'K', 'Q', 'J', 'T', '9', '8', '7', '6', '5', '4', '3', '2']

// Turn arrays of ranks and suits into a card deck
// 52 cards
const deck = (ranks, suits) => {
  const c = []
  ranks.map(rank => suits.map(suit => c.push([rank, suit])))
  return c;
}


// All possible 2 card combinations for Hold' Em
// 1,326 hands
const allHands = deck => {
  const a = []
  for (let i = 0; i < deck.length; i++) {
    const card1 = deck[i];
    for (let j = i + 1; j < deck.length; j++) {
      const card2 = deck[j];
      a.push([card1, card2])
    }
  }
  return a;
}

// hand - an array of 2 arrays [[rank, suit], [rank, suit]]
const pocketPair = (hand) => {
  if(hand[0][0] == hand[1][0]) {
    return true
  } else {
    return false
  }
}

// hand - an array of 2 cards [[rank, suit], [rank, suit]]
const suited = (hand) => {
  if (hand[0][1] == hand[1][1]) {
    return true 
  } else {
    return false
  }
}

const unsuited = (hand) => {
  if (suited(hand) || pocketPair(hand)) {
    return false
  } else {
    return true
  }
}

const cards = deck(ranks, suits)
const hands = allHands(cards)

const allSuited = hands.filter(suited)
const allPocketPairs = hands.filter(pocketPair)
const allUnsuited = hands.filter(unsuited)