Four in a row

var state = Object.freeze({

NotInitialized: 0,

Playing: 1,

Tie: 4,

Player1Won: 5,

Player2Won: 6,

});

var game = {

width: 7,

height: 6,

state: state.NotInitialized,

init: function() {

this.state = state.Playing;

this.player = 1;

this.board = [];

this.latest = undefined;

this.winner = 0;

for (let x = 0; x < this.width; x++) {

this.board[x] = [];

}

},

getAvailableCols: function() {

var cols = [];

if(this.winner == 0)

for(let x in this.board)

if(this.board[x].length < this.height)

cols.push(x);

return cols;

},

getWinner: function() {

if(this.winner > 0)

return this.winner;

var deltas = [1,2,3];

for(var x = 0; x < this.width; x++) {

for(var y = 0; y < this.height; y++) {

var player = this.board[x][y];

var upperBound = y < this.height - 3;

var lowerBound = y > 2;

var rightBound = x < this.width - 3;

if(player != undefined) {

if((upperBound && deltas.every(d => player == this.board[x][y+d])) //vertical

|| (rightBound

&& ((deltas.every(d => player == this.board[x+d][y])) //horizontal

|| (upperBound && deltas.every(d => player == this.board[x+d][y+d])) //diagonal right up

|| (lowerBound && deltas.every(d => player == this.board[x+d][y-d]))))) { //diagonal right down

return (this.winner = player);

}

}

}

}

return 0;

},

dropDisc: function(col) {

if(this.board[col].length == this.height) {

console.log("this column is full. Try another one!");

console.log(`the available columns are ${this.getAvailableCols()}`);

return false;

}

this.board[col].push(this.player);

this.latest = { x: col, y: (this.board[col].length - 1) };

if(this.getWinner() > 0)

{

this.state = state.Tie | this.winner;

}

else if(this.board.every(x => x.length == this.height))

{

this.state = state.Tie;

}

this.player ^= 3;

return true;

}

}

// game.init();

// console.log(game.board.length);

// console.log(game.getAvailableCols());