diff --git a/script.js b/script.js
index bbe8a293..ed5c0bde 100644
--- a/script.js
+++ b/script.js
@@ -1,4 +1,213 @@
+var makeDeck = function () {
+  var deck = [];
+
+  var suits = ["hearts", "diamonds", "clubs", "spades"];
+
+  var suitIndex = 0;
+  while (suitIndex < suits.length) {
+    var currentSuit = suits[suitIndex];
+
+    var counter = 1;
+    while (counter <= 13) {
+      var rankCounter = counter;
+      var cardName = rankCounter;
+
+      if (cardName == 1) {
+        cardName = "ace";
+      } else if (cardName == 11) {
+        rankCounter = 10;
+        cardName = "jack";
+      } else if (cardName == 12) {
+        rankCounter = 10;
+        cardName = "queen";
+      } else if (cardName == 13) {
+        rankCounter = 10;
+        cardName = "king";
+      }
+
+      var card = {
+        name: cardName,
+        suit: currentSuit,
+        rank: rankCounter,
+      };
+
+      deck.push(card);
+
+      counter = counter + 1;
+    }
+    suitIndex = suitIndex + 1;
+  }
+
+  return deck;
+};
+
+var getRandomIndex = function (size) {
+  return Math.floor(Math.random() * size);
+};
+
+var shuffleCards = function (cards) {
+  var index = 0;
+
+  while (index < cards.length) {
+    var randomIndex = getRandomIndex(cards.length);
+
+    var currentItem = cards[index];
+
+    var randomItem = cards[randomIndex];
+
+    cards[index] = randomItem;
+    cards[randomIndex] = currentItem;
+
+    index = index + 1;
+  }
+
+  return cards;
+};
+
+var deck = shuffleCards(makeDeck());
+
+var TWENTY_ONE = 21;
+var dealerHitThreshold = 16;
+var playerHasChosenToStand = false;
+var gameOver = false;
+
+var playerHand = [];
+var computerHand = [];
+
+var dealCardToHand = function (hand) {
+  hand.push(deck.pop());
+};
+
+var getHandSum = function (hand) {
+  var numAcesInHand = 0;
+  var sum = 0;
+  var counter = 0;
+  while (counter < hand.length) {
+    var currCard = hand[counter];
+    if (currCard.rank === 1) {
+      numAcesInHand += 1;
+      sum += 11;
+    } else {
+      sum += currCard.rank;
+    }
+
+    counter = counter + 1;
+  }
+  if (sum > TWENTY_ONE && numAcesInHand > 0) {
+    var aceCounter = 0;
+    while (aceCounter < numAcesInHand) {
+      sum -= 10;
+      if (sum <= TWENTY_ONE) {
+        break;
+      }
+      aceCounter = aceCounter + 1;
+    }
+  }
+  return sum;
+};
+
+//
+var isBlackjack = function (hand) {
+  return hand.length === 2 && getHandSum(hand) === TWENTY_ONE;
+};
+
+var convertHandToString = function (hand) {
+  var cards = "";
+  var handIndex = 0;
+
+  while (handIndex < hand.length) {
+    cards = cards + "," + hand[handIndex].name;
+    handIndex = handIndex + 1;
+  }
+
+  return cards;
+};
+
+var getDefaultOutput = function () {
+  return `Player has: ${convertHandToString(playerHand)} with sum ${getHandSum(
+    playerHand
+  )}. <br>
+    Computer has: ${convertHandToString(computerHand)} with sum ${getHandSum(
+    computerHand
+  )}.`;
+};
+
 var main = function (input) {
-  var myOutputValue = 'hello world';
-  return myOutputValue;
+  if (gameOver) {
+    return "The game is over. Please refresh to play again.";
+  }
+
+  if (playerHand.length === 0) {
+    dealCardToHand(playerHand);
+    dealCardToHand(computerHand);
+
+    dealCardToHand(playerHand);
+    dealCardToHand(computerHand);
+
+    if (isBlackjack(computerHand)) {
+      gameOver = true;
+      return `${getDefaultOutput()} <br>
+        Computer has Blackjack and wins. Please refresh to play again.`;
+    }
+
+    if (isBlackjack(playerHand)) {
+      gameOver = true;
+
+      return `${getDefaultOutput()} <br>
+        Player has Blackjack and wins. Please refresh to play again.`;
+    }
+
+    return `${getDefaultOutput()} <br>
+      Please enter "hit" or "stand", then press Submit`;
+  }
+
+  if (!playerHasChosenToStand) {
+    if (input !== "hit" && input !== "stand") {
+      return 'Please input either "hit" or "stand" as possible moves in Blackjack';
+    }
+
+    if (input === "hit") {
+      dealCardToHand(playerHand);
+
+      if (getHandSum(playerHand) > TWENTY_ONE) {
+        gameOver = true;
+        return `${getDefaultOutput()} <br>
+          Player has busted and loses. Please refresh to play again.`;
+      }
+    }
+
+    if (input === "stand") {
+      playerHasChosenToStand = true;
+    }
+  }
+  
+  var computerHandSum = getHandSum(computerHand);
+  if (computerHandSum <= dealerHitThreshold) {
+    dealCardToHand(computerHand);
+
+    computerHandSum = getHandSum(computerHand);
+
+    if (computerHandSum > TWENTY_ONE) {
+      gameOver = true;
+      return `${getDefaultOutput()} <br>
+      Computer has busted and loses. Please refresh to play again.`;
+    }
+  }
+
+  if (playerHasChosenToStand && computerHandSum > dealerHitThreshold) {
+    gameOver = true;
+
+    if (getHandSum(playerHand) > computerHandSum) {
+      return `${getDefaultOutput()} <br>
+        Player wins! Please refresh to play again.`;
+    }
+
+    return `${getDefaultOutput()} <br>
+      Computer wins! Please refresh to play again.`;
+  }
+
+  return `${getDefaultOutput()} <br>
+    playerHasChosenToStand is ${playerHasChosenToStand} <br>
+    If player has not yet chosen to stand, please enter "hit" or "stand". <br>
+    Else, press Submit to see Computer's next move.`;
 };