A way to output unicode information for a card number.

unicode_card.js

// https://en.wikipedia.org/wiki/Standard_52-card_deck
function unicodeCard(cardNumber) {
  // As of Unicode 7.0 playing cards are now represented. Note that the following chart ("Playing Cards", Range: 1F0A0–1F0FF) includes cards from the Tarot Nouveau deck as well as the standard 52-card deck.
  if (cardNumber < 0 || cardNumber > 56) { throw 'Invalid cardNumber '+cardNumber }
  cardNumber += 2*Math.max(Math.ceil(cardNumber/14),1);
  return String.fromCodePoint(127136-2+cardNumber);
}

function unicodeCardHTMLEncoded(cardNumber) {
  // As of Unicode 7.0 playing cards are now represented. Note that the following chart ("Playing Cards", Range: 1F0A0–1F0FF) includes cards from the Tarot Nouveau deck as well as the standard 52-card deck.
  if (cardNumber < 0 || cardNumber > 56) { throw 'Invalid cardNumber '+cardNumber }
  cardNumber += 2*Math.max(Math.ceil(cardNumber/14),1);
  return '&#'+(127136-2+cardNumber)+';';
}

function suit(cardNumber) {
  if (cardNumber < 0 || cardNumber > 56) { throw 'Invalid cardNumber '+cardNumber }
  switch(Math.ceil(cardNumber/14)) {
    case 1: return 'Spades'; break;
    case 2: return 'Hearts'; break;
    case 3: return 'Diamonds'; break;
    case 4: return 'Clubs'; break;;
  }
  return '?';
}

function suitUnicode(cardNumber) {
  if (cardNumber < 0 || cardNumber > 56) { throw 'Invalid cardNumber '+cardNumber }
  switch(Math.ceil(cardNumber/14)) {
    case 1: return '♠'; break;
    case 2: return '♥'; break;
    case 3: return '♦'; break;
    case 4: return '♣'; break;
  }
  return '?';
}