card counting example from fcc

Javascript

var count = 0;

function cc(card) {
  // Only change code below this line
  
  var return_val = "";

  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--;
  }

  if(count > 0) {
    return count + " Bet";
  } else {
    return count + " Hold";
  }

  // Only change code above this line
}

// Add/remove calls to test your function.
// Note: Only the last will display
cc(2); cc(3); cc(7); cc('K'); cc('A');

console.log( cc('K') );