matrix.js

var Matrix = function (rows, cols, bombs, rupoors) {
    var i, j;
    this.grid = [];
    this.rows = rows;
    this.cols = cols;
    this.bombs = bombs;
    this.rupoors = rupoors;
    this.leftToDig = (rows * cols) - (bombs + rupoors);

    // fill Matrix with empty holes...
    /*
     * I decided that if I made the grid the size it was supposed
     * to be in the first place there would be less deletion needed
     * later in the code
     */
    for (i = 0; i < cols; i++) {
        var row = [];
        for (j = 0; j < rows; j++) {
            row.push("white");
        }
        this.grid.push(row);
    }
    this.plantItems("bomb");
    this.plantItems("rupoor");
    for (i = 0; i < cols; i++) {
        for (j = 0; j < rows; j++) {
            if(this.grid[i][j] === "white") {
                this.determineColor(i, j);
            }
        }
    }
};

Matrix.prototype.plantItems = function (item) {
    var items = 0;
    while (items < this[item + "s"]) {
        var item_x = Math.floor(Math.random()*(this.cols));
        var item_y = Math.floor(Math.random()*(this.rows));
        if (this.grid[item_x][item_y] === "white") {
            this.grid[item_x][item_y] = item;
            items++;
        }
    }
};

Matrix.prototype.hasBomb = function (x, y) {
    return this.grid[x] && this.grid[x][y] === "bomb";
};

Matrix.prototype.surroundingBombs = function (col, row) {
    var bombs, i, j;
    bombs = 0;
    for (i = -1;i <= 1;i += 1) {
        for (j = -1;j <= 1;j += 1) {
            if (this.hasBomb(col + i, row + j) && !(i === 0 && j === 0)) {
                bombs++;
            }
        }
    }
    return bombs;
};

Matrix.prototype.determineColor = function (x, y) {
    switch (this.surroundingBombs(x, y)) {
        case (0):
            this.grid[x][y] = "green";
            break;
        case (1):
        case (2):
            this.grid[x][y] = "blue";
            break;
        case (3):
        case (4):
            this.grid[x][y] = "red";
            break;
        case (5):
        case (6):
            this.grid[x][y] = "silver";
            break;
        case (7):
        case (8):
            this.grid[x][y] = "gold";
            break;
    }
};

var matrix = new Matrix(5, 8, 8, 8);
console.log(matrix.grid);