class Point {

    constructor(x, y){

        this.x = x;

        this.y = y;

    }

​

    add(point){

        return new Point(this.x + point.x, this.y + point.y);

    }

​

    sub(point){

        return new Point(this.x - point.x, this.y - point.y);

    }

}

​

var p1 = new Point(10, 10);

var p2 = new Point(10, -10);

var sum = p1.add(p2);

var dif = p1.sub(p2);

function Point(x, y){

    this.x = x;

    this.y = y;

}

​

Point.prototype.add = function(point){

    return new Point(this.x + point.x, this.y + point.y);

}

​

Point.prototype.sub = function(point){

    return new Point(this.x - point.x, this.y - point.y);

}

​

var p1 = new Point(10, 10);

var p2 = new Point(10, -10);

var sum = p1.add(p2);

var dif = p1.sub(p2);

​

function Point(x, y){

    return {

        x, 

        y, 

        add: (point)=>Point(this.x + point.x, this.y + point.y),

        sub: (point)=>Point(this.x - point.x, this.y - point.y)

    }  

}

​

var p1 = Point(10, 10);

var p2 = Point(10, -10);

var sum = p1.add(p2);

var dif = p1.sub(p2);

const point = (x, y) => ({ x, y });

const add = (a, b) => ({ x: a.x + b.x, y: a.y + b.y });

const sub = (a, b) => ({ x: a.x - b.x, y: a.y - b.y });

​

var p1 = point(10, 10);

var p2 = point(10, -10);

var sum = add(p1, p2);

var dif = sub(p1, p2);