moved ticTacToe.js into its own branch

03week/ticTacToe.js

@@ -6,6 +6,7 @@ const rl = readline.createInterface({
   input: process.stdin,
   output: process.stdout
 });
+
 let board = [
   [' ', ' ', ' '],
   [' ', ' ', ' '],
@@ -14,7 +15,7 @@ let board = [
 
 let playerTurn = 'X';
 
-function printBoard() {
+let printBoard = () => {
   console.log('   0  1  2');
   console.log('0 ' + board[0].join(' | '));
   console.log('  ---------');
@@ -23,29 +24,145 @@ function printBoard() {
   console.log('2 ' + board[2].join(' | '));
 }
 
-function horizontalWin() {
-  // Your code here
+// define reset function to reset board after a game:
+let reset = () => {
+  board = [
+    [' ', ' ', ' '],
+    [' ', ' ', ' '],
+    [' ', ' ', ' ']
+  ];
+  playerTurn = 'X';
+  turnCount = 1;
+}
+
+// make a string depending on the playerTurn, e.g. 'XXX' or 'OOO' to compare against:
+let playerString = playerTurn + playerTurn + playerTurn;
+
+let horizontalWin = () => {
+  // method for row win state using .every():
+  if(
+    (board[0].every(x => x == playerTurn)) ||
+    (board[1].every(x => x == playerTurn)) ||
+    (board[2].every(x => x == playerTurn))
+  ) {
+    return true;
+  }
+  else return false;
+
+  // method using for/in with string comparators and joining the row arrays together (not working as intended):
+  // for( let i in board ) {
+  //   // join each subarray into a string with no spaces:
+  //   let rowString = board[i].join('');
+  //   // compare rowString against playerString to detect horizontal win:
+  //   if( rowString == playerString ) {
+  //     return true;
+  //   }
+  //   else return false;
+  // }
+}
+
+let verticalWin = () => {
+  // brute force method that i'm not super happy with, checking each possible win iteration using && and || in an if statement:
+  if(
+    (board[0][0] == playerTurn && board[1][0] == playerTurn && board[2][0] == playerTurn) ||
+    (board[0][1] == playerTurn && board[1][1] == playerTurn && board[2][1] == playerTurn) ||
+    (board[0][2] == playerTurn && board[1][2] == playerTurn && board[2][2] == playerTurn)
+  ) {
+    return true;
+  }
+  else return false;
 }
 
-function verticalWin() {
-  // Your code here
+let diagonalWin = () => {
+  // check middle square first, because it can't be a diagonal win if the middle square isn't occupied:
+  if( board[1][1] != playerTurn ) {
+    return false;
+  }
+  // else brute force check the remaining spaces required to make a diagonal win:
+  else if((board[0][0] == playerTurn && board[2][2] == playerTurn) || 
+          (board[0][2] == playerTurn && board[2][0] == playerTurn)) {
+    return true;
+  }
+  else return false;
 }
 
-function diagonalWin() {
-  // Your code here
+// make checkForWin return true if any of the win state checks are true:
+let checkForWin = () => {
+  if( horizontalWin() || verticalWin() || diagonalWin() ) {
+    return true;
+  }
+  else return false;
 }
 
-function checkForWin() {
-  // Your code here
+// create a function to return true if the choices are valid (note: added number cases cuz prewritten test wouldn't work with strings):
+let choiceChecker = ( row, column ) => {
+  switch(row){
+    case '0':
+    case '1':
+    case '2':
+    case 0:
+    case 1:
+    case 2:
+      break;
+    default:
+      return false;
+  }
+  switch(column){
+    case '0':
+    case '1':
+    case '2':
+    case 0:
+    case 1:
+    case 2:
+      return true;
+    default:
+      return false;
+  }
 }
 
-function ticTacToe(row, column) {
-  // Your code here
+// create function to flip turn (just to make it easier to read in the ticTacToe function):
+let flipTurn = () => {
+  playerTurn == 'X' ? playerTurn = 'O' : playerTurn = 'X';
 }
 
-function getPrompt() {
+// create turn counter variable as storage to help determine a tie/cat's game:
+let turnCount = 1;
+
+let ticTacToe = ( row, column ) => {
+  // Check if turn is valid:
+  let isValid = choiceChecker(row, column);
+  // If turn is not valid, say so:
+  if( !isValid ) {
+    console.log('Try again, enter a valid row and column!');
+  }
+  // else if chosen space is already occupied, say so:
+  else if( board[row][column] != ' ' ) {
+    console.log('That space is already taken, try again!');
+  }
+  // or else put the current turn ('X' or 'O') in the array space represented by the inputs:
+  else {
+    board[row][column] = playerTurn;
+    // check if there's a win, if so log it and reset the board:
+    if( checkForWin() ) {
+      console.log( `${playerTurn} wins!` );
+      reset();
+    }
+    // or else if there's no winner and all the spaces are full, log tie game and reset:
+    else if( !checkForWin() && turnCount == 9 ) {
+      console.log( "Cat's game! Tie!" );
+      reset();
+    }
+    // or else flip the turn and add 1 to the turn counter:
+    else {
+      flipTurn();
+      turnCount++;
+    }
+  }
+}
+
+let getPrompt = () => {
   printBoard();
-  console.log("It's Player " + playerTurn + "'s turn.");
+  console.log( `It's player ${playerTurn}'s turn.` );
   rl.question('row: ', (row) => {
     rl.question('column: ', (column) => {
       ticTacToe(row, column);
@@ -55,8 +172,6 @@ function getPrompt() {
 
 }
 
-
-
 // Tests
 
 if (typeof describe === 'function') {