counting-cards-exercise.js

// In the casino game Blackjack, a player can gain an advantage over the house by keeping track of the relative number of high and 
// low cards remainin in the deck. This is called Card Counting. Having more high cards remaining in the deck favors the player. 
// Each card is assigned a value according to the table below.  When the count is positive, the player should bet high. When the count 
// is zero or negative, the player should bet low.

// Let's write a card counting function. It will receive a 'card' parameter, which can be a number or a string, and increment or decrement 
// the global 'count' variable according to the card's value. The function will then return a string with the current count and the string 
// 'Bet' if the count is positive, or 'Hold' if the count is zero or negative. The current count and the player's decision ('Bet' or 'Hold') 
// should be separated by a single space.

var count = 0;

function cc(card) {
switch (card) {
  case 2:
  case 3:
  case 4:
  case 5:
  case 6:
    count++;
    break;
  case 10:
  case "J":
  case "Q":
  case "K":
  case "A":
    count--;
    break;
}
  if (count > 0) {
    return count + " Bet";
  } else {
    return count + " Hold";
  }
}

cc(2); cc(3); cc(7); cc('K'); cc('A');