Method add

javascript/2013-detect-squares.js:11–18

(point, { map, points } = this)

    }
    
    add (point, { map, points } = this) {
        const [ x, y ] = point;
        const key = this.getKey(x, y);
        const value = ((map[key] || 0) + 1);

        map[key] = value;  /* Space O(N) */
        points.push(point);/* Space O(N) */
    }

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