gistfile1.txt

Game.prototype.hasCombo = function() {
    for (var index = 0, l = this.state.length; index < l; index++) {
        var combo = [],
            skip = [],
            current,
            next;

        current = index;
        while (true) {
            combo.push(current);

            if (combo.length >= MIN_SELECTION) {
                return true;
            }

            // move right
            next = current + 1;
            if (this.state[current] === this.state[next] &&
                (current + 1) % WIDTH !== 0 &&
                !~combo.indexOf(next) &&
                !~skip.indexOf(next)
            ) {
                current = next;
                continue;
            }

            // move down
            next = current + WIDTH;
            if (this.state[current] === this.state[next] &&
                next < WIDTH * HEIGHT &&
                !~combo.indexOf(next) &&
                !~skip.indexOf(next)
            ) {
                current = next;
                continue;
            }

            // move left
            next = current - 1;
            if (this.state[current] === this.state[next] &&
                current % WIDTH !== 0 &&
                !~combo.indexOf(next) &&
                !~skip.indexOf(next)
            ) {
                current = next;
                continue;
            }

            // try again w/o this index
            if (combo.length > 1) {
                skip.push(current);
                current = index;
                combo = [];
                continue;
            }

            // try next index
            break;
        }
    }

    return false;
};