Axel Rauschmayer wrote:
http://www.slideshare.net/BrendanEich/value-objects
One thing is not entirely clear from the slides: Will developers be
able to define their own value object types? Without that feature I
don’t see how overloading operators would be very interesting.
That is out of date compared to
http://www.slideshare.net/BrendanEich/js-resp
specifically slide 15:
http://image.slidesharecdn.com/jsresp-130914140214-phpapp02/95/slide-15-638.jpg?1379296961
which has:
value class point2d { // implies typeof “point2d”
constructor point2d(x, y) {
this.x = +x;
this.y = +y;
// implicit Object.freeze(this) on return
}
point2d + number (a, b) {
return point2d(a.x + b, a.y + b);
}
number + point2d (a, b) {
return point2d(a + b.x, a + b.y);
}
point2d + point2d (a, b) {
return point2d(a.x + b.x, a.y + b.y);
}
// more operators, suffix declaration handler, etc.
}
The idea is to provide convenient declartive syntax for operator
multimethods that dispatch along the lines proposed by Christian Hansen.
Some work required to handle subclassing, Christian has been helping,
writing it up is on my plate for this month.
/be
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