connect four - built in 1 hour for an interview

connect_four.js

var GameView = require('./console_view.js');

function ConnectFour() {
  this.buildBoard();
  this.player = 1;
  this.playerWon = false;
}

ConnectFour.prototype.buildBoard = function() {
  var board = [], row;
  for( var i = 0; i < 6; i++ ) {
    row = [];
    for (var j = 0; j < 7; j++) {
      row.push(0);
    }
    board.push( row );
  }
  this.board = board;
}

ConnectFour.prototype.placePiece = function( input ) {
  var i = 0;
  while ( i < 6 && this.board[i][parseInt(input)] === 0 ) {
    i++;
  }
  this.board[i-1][parseInt(input)] = this.player;
  this.switchPlayer();
}

ConnectFour.prototype.isWon = function() {
  var consecutive, currentChip, x, y;
  for (var i = 0; i < 6; i++) {
    for (var j = 0; j < 7; j++) {
      currentChip = this.board[i][j];
      if ( currentChip ) {
        // console.log("Found chip at " + j + ", " + i );
        [[1,0],[1,1],[0,1],[-1,1]].forEach( function( dir ) {
          consecutive = 0;
          y = i;
          x = j;
          // console.log( x + " " + y);
          while ( (( x < 7 && x >= 0 ) && ( y < 6 && y >= 0 )) && this.board[y][x] === currentChip ) {
            y += dir[0];
            x += dir[1];
            consecutive++;
            // console.log("==== testing " + x + ", " + y + " consecutive: " + consecutive);
            if ( consecutive >= 4 ) {
              this.playerWon = true;
            }
          }
        }.bind(this));
        if ( this.playerWon ) {
          return true;
        }
      }
    }
  }
  return false;
}

ConnectFour.prototype.switchPlayer = function () {
  if ( this.player == 1 ) {
    this.player = 2;
  } else {
    this.player = 1;
  }
};

var game = new ConnectFour();
var gameView = new GameView( game );

gameView.run();

console_view.js

var readline = require('readline');

  var interface = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});

function ConsoleView( game ) {
  this.game = game;
}

ConsoleView.prototype.run = function() {
  this.draw();
  this.prompt();
}

ConsoleView.prototype.prompt = function() {
  interface.question( "Player " + this.game.player + " , where? ", function( input ) {
    this.placePiece(input);
    if ( this.game.isWon() ) {
      console.log("Player " + this.game.player + " has won!");
      process.exit();
    } else {
      this.prompt();
    }
  }.bind(this));
}

ConsoleView.prototype.placePiece = function( input ) {
  this.game.placePiece( input );
  this.draw();
}

ConsoleView.prototype.draw = function() {
  var printedLine;
  this.game.board.forEach( function( row ) {
    printedLine = "";
    row.forEach( function( square ) {
      if ( square === 0 ) {
        printedLine += "[ ]";
      } else if ( square === 1 ) {
        printedLine += "[X]";
      } else {
        printedLine += "[O]";
      }
    });
    console.log(printedLine);
  });
}

module.exports = ConsoleView;