repl tic tac toe

index.js

@@ -0,0 +1,145 @@
+let readlineSync = require('readline-sync');
+
+let userScore = 0;
+let computerScore = 0;
+const startValues = [[" "," "," "], [" "," "," "], [" "," "," "]] // this is a 3x3 matrix containing the tic tac toe values 
+let boardValues = [[" "," "," "], [" "," "," "], [" "," "," "]]
+const referenceValues = [[0,1,2], [3,4,5], [6,7,8]];
+const positionsObject = {
+    0: [0,0],
+    1: [0,1],
+    2: [0,2],
+    3: [1,0],
+    4: [1,1],
+    5: [1,2],
+    6: [2,0],
+    7: [2,1],
+    8: [2,2]
+}
+
+
+const userName = readlineSync.question("Please enter your name: \n");
+console.log(`Hi there ${userName}, welcome to command line based Tic Tac Toe! \n`);
+
+
+function startOfGame () { 
+    boardValues = [[" "," "," "], [" "," "," "], [" "," "," "]];
+    process.stdout.write('\033c'); // this clears the command line text above it
+    const userFlip = readlineSync.question("Input H for heads, or T for tails to see who's going first: \n"
+    , {limit: ["H","T"], limitMessage: "Incorrect input, please enter either 'H' for heads or 'T' for tails \n"});
+    const computerFlip = Math.floor(Math.random()*2);
+    if (userFlip === "H" && computerFlip == 1) {
+        game("User");
+    }
+    else if (userFlip === "T" && computerFlip == 0) {
+        game("User");
+    }
+    else {
+        game("Computer");
+    };
+}
+
+function tttBoard (boardValue = boardValues) {   // this function draws the board with its updated values
+    const row1 = ` ${boardValue[0][0]} | ${boardValue[0][1]} | ${boardValue[0][2]} \n`;
+    const row2 = `___|___|___\n`;
+    const row3 = ` ${boardValue[1][0]} | ${boardValue[1][1]} | ${boardValue[1][2]} \n`;
+    const row4 = `___|___|___\n`;
+    const row5 = ` ${boardValue[2][0]} | ${boardValue[2][1]} | ${boardValue[2][2]} \n`;
+    const row6 = `   |   |   `;
+    console.log(row1+row2+row3+row4+row5+row6 + '\n');
+};
+
+
+function game (firstToAct, userScores, computerScores) {
+    let freePositions = [0,1,2,3,4,5,6,7,8];
+    // boardValues = startValues;
+    if (firstToAct == "User") {
+        tttBoard(referenceValues);
+        console.log("You're first to act! You will have 'X' and the computer will have 'O'. \n");
+        gameLoop(freePositions);
+    }
+    else {
+        tttBoard(referenceValues);
+        console.log("You lost the flip, you are second to go and you will have 'O' \n")
+        let compPos = freePositions[Math.floor(Math.random()*freePositions.length)];
+        boardValues[positionsObject[compPos][0]][positionsObject[compPos][1]] = 'O';
+        let indexToRemove2 = freePositions.indexOf(compPos);
+        freePositions.splice(indexToRemove2,1);
+        tttBoard();
+        gameLoop(freePositions);
+    }
+    restart();
+}
+
+function gameLoop (freePositions) {
+    while (true) {
+        let location = parseInt(readlineSync.question("Choose a number from 0 to 8 to specify the placement of your 'X': \n", 
+            {limit: freePositions, limitMessage: "Incorrect input, make sure to input a single integer in the range {0,8}, "
+            +"not including already occupied positions."}));
+        console.log('\n');
+        boardValues[positionsObject[location][0]][positionsObject[location][1]] = 'X';
+        if (checkWin() == 'User') {
+            break;
+        } else if (checkWin() == 'Computer') {
+            break;
+        };
+        let indexToRemove1 = freePositions.indexOf(location);
+        freePositions.splice(indexToRemove1,1);
+        let compPos = freePositions[Math.floor(Math.random()*freePositions.length)];
+        boardValues[positionsObject[compPos][0]][positionsObject[compPos][1]] = 'O';
+        let indexToRemove2 = freePositions.indexOf(compPos);
+        freePositions.splice(indexToRemove2,1);
+        if (checkWin() == 'User') {
+            break;
+        } else if (checkWin() == 'Computer') {
+            break;
+        };
+        tttBoard();
+        if (freePositions.length == 0) {    
+            console.log("IT'S A TIE!!!!! \n");
+            break;
+        }
+        }
+    tttBoard();
+}
+
+function checkWin() {
+    let winningCombos = [
+        [boardValues[0][0],boardValues[0][1],boardValues[0][2]],
+        [boardValues[1][0],boardValues[1][1],boardValues[1][2]],
+        [boardValues[2][0],boardValues[2][1],boardValues[2][2]],
+        [boardValues[0][0],boardValues[1][0],boardValues[2][0]],
+        [boardValues[0][1],boardValues[1][1],boardValues[2][1]],
+        [boardValues[0][2],boardValues[1][2],boardValues[2][2]],
+        [boardValues[0][0],boardValues[1][1],boardValues[2][2]],
+        [boardValues[0][2],boardValues[1][1],boardValues[2][0]]
+    ];
+    let winner;
+    winningCombos.forEach( combo => {
+        if (combo.join('') == 'XXX') {
+            userScore++;
+            winner = 'User';
+            console.log('           YOU WON!!!!!');
+        }
+        else if (combo.join('') == 'OOO') {
+            computerScore++;
+            winner = 'Computer';
+            console.log('           YOU LOST!!!!!');
+        };
+    });
+    return winner;
+}
+
+function restart () {
+    console.log(` User score: ${userScore} | Computer score: ${computerScore}`);
+    const toRestartOrNot = readlineSync.question("Would you like to play again? Enter Y for Yes or N for No: \n",
+    {limit: ['Y','N'],limitMessage: "Incorrect input, please enter either 'Y' for yes or 'N' for no \n"});
+    if (toRestartOrNot == 'Y') {
+        startOfGame();
+    }
+    else {
+        console.log(' GAME OVER \n');
+    }
+}
+
+startOfGame();