Upgrade dependencies and refactor various things

package.json

@@ -6,12 +6,12 @@
   "dependencies": {
     "@types/jest": "24.0.18",
     "@types/node": "12.7.2",
-    "@types/react": "16.9.2",
-    "@types/react-dom": "16.8.5",
+    "@types/react": "18.3.5",
+    "@types/react-dom": "18.3.0",
     "gh-pages": "^2.1.1",
-    "react": "^16.9.0",
-    "react-dom": "^16.9.0",
-    "react-scripts": "^3.3.0",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
+    "react-scripts": "^5.0.1",
     "typescript": "3.5.3"
   },
   "scripts": {

src/calculateHandValue.ts

@@ -0,0 +1,34 @@
+import {Card} from './sharedTypes'
+
+const faceCards = ['K', 'Q', 'J']
+
+const calculateHandValue = (cards: Card[]) => {
+  let total = 0;
+  const visibleCards = cards.filter(card => !card.hidden)
+  visibleCards.forEach((card) => {
+    if (card.value !== 'A') {
+      total += faceCards.includes(card.value) ? 10 : Number(card.value);
+    }
+  });
+  const aces = visibleCards.filter((card) => card.value === 'A');
+  aces.forEach((card) => {
+    if ((total + 11) > 21) {
+      total += 1;
+    }
+    else if ((total + 11) === 21) {
+      if (aces.length > 1) {
+        total += 1;
+      }
+      else {
+        total += 11;
+      }
+    }
+    else {
+      total += 11;
+    }
+  });
+
+  return total;
+}
+
+export default calculateHandValue