Le 08/06/2013 20:22, Axel Rauschmayer a écrit :
It's difficult to do that if you want your constructors to remain
subtypable. Is the following the best we can do? A constructor can
only freeze if it is the first constructor that is invoked.
function Point(x, y) {
this.x = x;
this.y = y;
if (this.constructor === Point) {
Object.freeze(this);
}
}
function ColorPoint(x, y, color) {
Point.call(this, x, y);
Super-ugly solution: warp 'this' in a proxy with a shadow (freezable)
target and forward all non-freezing operations to 'this'.
this.color = color;
if (this.constructor === ColorPoint) {
Object.freeze(this);
}
}
ColorPoint.prototype = Object.create(Point);
ColorPoint.prototype.constructor = ColorPoint;
(More detailed write-up:
http://www.2ality.com/2013/06/freezing-instances.html )
Maybe classes and the @@construct separation (and convention) can help?
David
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