Mark S. Miller wrote:
> <inheritance>
>
>
> Point as a non-final non-abstract root/mixin class where toString is a
> final method:
>
> function PointMixin(self, x, y) {
> Object.defineProperties(self, {
> toString: {value: Object.freeze(function() ('<' + self.getX()
> + ',' + self.getY() + '>'))},
> enumerable: true},
> getX: {value: Object.freeze(function() x),
> enumerable: true, flexible: true},
> getY: {value: Object.freeze(function() y),
> enumerable: true, flexible: true}
> });
> }
> function Point(x, y) {
> const self = Object.create(Point.prototype); // only for instanceof
> PointMixin(self, x, y);
> return Object.freeze(self);
> }
> Object.freeze(PointMixin);
> Object.freeze(Point.prototype);
> Object.freeze(Point);
>
>
> WobblyPoint as a non-abstract non-final subclass:
>
> function WobblyPointMixin(self, wobble) {
> const super = Object.snapshot(self); // a snapshot is a frozen copy
> Object.defineProperties(self, {
> getX: {value: function() (super.getX() + Math.random()*wobble),
> enumerable: true, flexible: true}
> });
> }
> function WobblyPoint(x, y, wobble) {
> const self = Object.create(WobblyPoint.prototype); // only for instanceof
> PointMixin(self, x, y);
> WobblyPointMixin(self, wobble);
> return Object.freeze(self);
> }
> Object.freeze(WobblyPointMixin);
> WobblyPoint.prototype = Object.create(Point.prototype, {
> constructor: {value: WobblyPoint}
> }, true);
> Object.freeze(WobblyPoint);
>
>
> This gets self-overriding a super-binding correct under single
> inheritance and even under linearized multiple inheritance.
>
>
> </inheritance>
>
That code is ugly.
-dean
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