Blackjack game from week 12 of CodeYear

Blackjack.js

function Card(suit, num) {
    var cardSuit = suit;
    var cardNum = num;
    this.getNumber = function() {
      return cardNum;  
    };
    this.getSuit = function() {
      return cardSuit;
    };
    this.getValue = function() {
      var score;
      if(cardNum >10 && cardNum <14) {
         score = 10;
      }else if(cardNum === 1) {
         score = 11;
      }else {
         score = cardNum;
      }
      return score;
    };
}

function deal() {
      var suit = Math.floor(Math.random()*4+1);
      var num = Math.floor(Math.random()*13+1);
      var newCard = new Card(suit, num);
      return newCard;
}
    
function Hand() {
 var cards =[];
 cards.push(deal());
 cards.push(deal());
 this.getHand = function() {
   return cards;  
 };
 this.score = function() {
    var sum = 0;
    var aces = 0;
    for (i=0; i<cards.length; i++) {
      sum += cards[i].getValue();
      if(cards[i].getValue == 11){
          aces += 1;
      } 
    }
    while(sum > 21 && aces >= 0){
        sum -= 10;
        aces -= 1;
    }
    return sum;
  };
  this.stringSuit = function(num) {
    switch(num) 
    {
    case 1:
      return "Diamonds";
      break;
    case 2:
      return "Hearts";
      break
    case 3:
      return "Spades";
      break;
    case 4:
      return "Clubs";
      break;
    }
  };     
  this.printHand = function() {
    var hand = [];
    for(i=0; i<cards.length; i++) {
      hand.push(" "+ cards[i].getNumber() + " of " + this.stringSuit(cards[i].getSuit()) );
      }
    return hand;
 };
 this.hitMe = function() {
     cards.push(deal());
 };
}

function playAsDealer() {
    var dHand = new Hand();
    var dScore = dHand.score();
    while(dScore <= 17) {
        dHand.hitMe();
        dScore = dHand.score();
    }
    return dHand;
}

function playAsUser() {
    var pHand = new Hand();
    var pHit = confirm(pHand.printHand());
    while(pHit === true) {
        pHand.hitMe();
        pHit = confirm(pHand.printHand());
    }return pHand;
    
    
}

function declareWinner(userHand, dealerHand) {
    var userScore = userHand.score();
    var dealerScore = dealerHand.score();
    if (dealerScore > 21){
        return "You win!";
    }else if (userScore >21) {
        return "You lose!";
    }else if (userScore > dealerScore) {
        return "You win!";
    }else if (userScore < dealerScore) {
        return "You lose!";
    }else{
        return "You tied!";
    }
}

function playGame() {
    var user = playAsUser();
    var dealer = playAsDealer();
    console.log("Your score is " + user.score() + ".");
    console.log("Dealer's score is " + dealer.score() + ".");
    console.log(declareWinner(user, dealer));
}
playGame();