Method getKey

javascript/2013-detect-squares.js:35–37

(x, y)

    };

    getKey (x, y) {
        return `${x},${y}`;
    }

    getScore (x1, y1, x2, y2, { map } = this) {
        const [ aKey, bKey ] = [ this.getKey(x1, y2), this.getKey(x2, y1) ];