Point

This challenge needs you to implement a Point class so that the following code returns true.

new Point( new Point(10, 20) + new Point(30, 50) ).toString() === '{40,70}';

Implement Point and assume that:

• Must be generic and be able to handle x and y values from 0..999

• The requirements to do it are to implement valueOf and/or toString methods.

var Point = function (x, y) {
    if(typeof x === 'string') {
        this.convertStringToCoordinates(x);
    }else{
        this.x = x;
        this.y = y;
    }
};
Point.prototype.convertStringToCoordinates = function ( value ) {
    var arr, index, len, item;
    this.x = 0;
    this.y = 0;
    arr = JSON.parse('[' + value.replace(/{/g,'[').replace(/}/g,']').replace( new RegExp('\\]\\[', 'g'), '],[') + ']');
    len = arr.length;
    for(index = 0; index < len; index++) {
        item = arr[index];
        this.x += item[0];
        this.y += item[1];
    }
};
Point.prototype.toString = function () {
    return '{' + this.x + ',' + this.y + '}';
};

assert(new Point( new Point(10, 20) + new Point(30, 50) ).toString() === '{40,70}');