Class js

function Coord2D(X, Y) {
    var _this = this;

    (function() {
        _this.X = X || 0;
        _this.Y = Y || 0;
    })();

    // Retourne la distance entre 2 points
    this.getDistance = function(coordTo) {
        return Math.pow(_this.X - coordTo.X, 2) + Math.pow(_this.Y - coordTo.Y, 2);
    };
}

var pointA = new Coord2D();
var pointB = new Coord2D(2, 2);
var dist = pointA.getDistance(pointB);