100% win rate

players/4/index.mjs

@@ -3,7 +3,7 @@
  */
 export default class Player {
   static get name () {
-    return `Andy is Awesome`;
+    return `Team 4 rules`;
   }
 
   /**
@@ -28,7 +28,159 @@ export default class Player {
    *  6 | 7 | 8
    */
   static makeMove(token, gameState) {
-    // Just pick the first open square.
-    return gameState.indexOf('-');
+    let move;
+
+    let antitoken;
+    if (token === 'X') {
+      antitoken = 'O'
+    } else {
+      antitoken = 'X'
+    }
+
+    if (gameState[4] === '-') {
+      move = 4;
+    }
+
+    gameState.forEach((item, index) => {
+      if (item === '-') {
+        neighborObject[index].forEach(neighbor => {
+          if (gameState[neighbor] == token) {
+            move = Number(index)
+          }
+        })
+      }
+    })
+
+    if (checkForDiagonalVic(antitoken, gameState)) {
+      move = checkForDiagonalVic(antitoken, gameState)
+    }
+    if (checkForHorizVic(antitoken, gameState)) {
+      move = checkForHorizVic(antitoken, gameState)
+    }
+    if (checkForVertVic(antitoken, gameState)) {
+      move = checkForVertVic(antitoken, gameState)
+    }
+
+    if (checkForDiagonalVic(token, gameState)) {
+      move = checkForDiagonalVic(token, gameState)
+    }
+    if (checkForHorizVic(token, gameState)) {
+      move = checkForHorizVic(token, gameState)
+    }
+    if (checkForVertVic(token, gameState)) {
+      move = checkForVertVic(token, gameState)
+    }
+
+    return move || gameState.indexOf('-');
   }
 };
+
+const neighborObject = {
+  '0': ['1','3','4'],
+  '1': ['0', '2', '3', '4', '5'],
+  '2': ['1', '4', '5'],
+  '3': ['0', '1', '4', '6', '7'],
+  '4': ['0', '1', '2', '3', '4', '5', '6', '7', '8'],
+  '5': ['1', '2', '4', '7', '8'],
+  '6': ['3', '4', '7'],
+  '7': ['3', '4', '5', '6', '8'],
+  '8': ['4', '5', '7'],
+}
+
+// tokenObject = {
+//   '0': 0,
+//   '1': 0,
+//   '2': 0,
+//   '3': 0,
+//   '4': 0,
+//   '5': 0,
+//   '6': 0,
+//   '7': 0,
+//   '8': 0,
+// }
+
+function checkForDiagonalVic(token, gameState) {
+  if (gameState[0] === token && gameState[4] === token) {
+    return 8;
+  }
+  if (gameState[0] === token && gameState[8] === token) {
+    return 4;
+  }
+  if (gameState[4] === token && gameState[8] === token) {
+    return 0;
+  }
+
+  if (gameState[2] === token && gameState[4] === token) {
+    return 6;
+  }
+  if (gameState[2] === token && gameState[6] === token) {
+    return 4;
+  }
+  if (gameState[4] === token && gameState[6] === token) {
+    return 2;
+  }
+}
+
+function checkForHorizVic(token, gameState) {
+  if (gameState[0] === token && gameState[1] === token) {
+    return 2;
+  }
+  if (gameState[0] === token && gameState[2] === token) {
+    return 1;
+  }
+  if (gameState[1] === token && gameState[2] === token) {
+    return 0;
+  }
+
+  if (gameState[3] === token && gameState[4] === token) {
+    return 5;
+  }
+  if (gameState[3] === token && gameState[5] === token) {
+    return 4;
+  }
+  if (gameState[4] === token && gameState[5] === token) {
+    return 3;
+  }
+
+  if (gameState[6] === token && gameState[7] === token) {
+    return 8;
+  }
+  if (gameState[6] === token && gameState[8] === token) {
+    return 7;
+  }
+  if (gameState[7] === token && gameState[8] === token) {
+    return 6;
+  }
+}
+
+function checkForVertVic(token, gameState) {
+  if (gameState[0] === token && gameState[3] === token) {
+    return 6;
+  }
+  if (gameState[0] === token && gameState[6] === token) {
+    return 3;
+  }
+  if (gameState[3] === token && gameState[6] === token) {
+    return 0;
+  }
+
+  if (gameState[1] === token && gameState[4] === token) {
+    return 7;
+  }
+  if (gameState[1] === token && gameState[7] === token) {
+    return 4;
+  }
+  if (gameState[4] === token && gameState[7] === token) {
+    return 1;
+  }
+
+  if (gameState[2] === token && gameState[5] === token) {
+    return 8;
+  }
+  if (gameState[5] === token && gameState[8] === token) {
+    return 2;
+  }
+  if (gameState[2] === token && gameState[8] === token) {
+    return 5;
+  }
+}

players/4/test.mjs

@@ -0,0 +1,3 @@
+import Player from './index';
+
+Player.makeMove('X', ['X', '-', '-', '-', '-', '-', '-', '-', '-'])