Method count

javascript/2013-detect-squares.js:20–33

(point, { points } = this, score = 0)

    }

    count (point, { points } = this, score = 0) {
        const [ x1, y1 ] = point;

        for (const [ x2, y2 ] of points) {/* Time O(N) */
            const isSame = (Math.abs(x2 - x1) === Math.abs(y2 - y1));
            const isEqual = ((x1 === x2) || (y1 === y2));
            const canSkip = (!isSame || isEqual);
            if (canSkip) continue;

            score += this.getScore(x1, y1, x2, y2);
        }

        return score;
    };

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