Advice/Timeline on using Value Objects?
brendan at mozilla.com
Thu Jan 23 16:25:39 PST 2014
Tab Atkins Jr. wrote:
> Using value objects would make this explicit, and would allow
> convenient operator overloading, so you can do:
> var x = CSS.px(5);
> var y = CSS.px(10);
> var z = x + y;
With value objects, you could do even better:
// something declarative to import suffix px as CSS.px here
let x = 5px;
let y = 10px;
let z = x + y;
> I'm okay with this being 1 or 2 years down the road.
That's my time frame, and ES7's.
> Alternately, how close can I get to truly immutable objects? I want
> something that can't be expando'd or altered in any way, so our impl
> can share objects when possible.
Without value objects, you have reference-based identity, so
CSS.px(5) !== CSS.px(5)
No bueno. You want value objects. Working on it for next week's TC39
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