elemental2: Native maps with primitive types?

[Vassilis Virvilis]

Hi,

Is it possible to define and use in java a javascript map (JsObject,
JsPropertyMap) that can accept plain numbers as the values of the map?

I didn't find a way. JsPropertyMap expect objects.

Thanks

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Vassilis Virvilis

[Jens]

JsPropertyMap.set(key, value) is marked with @DoNotAutoBox, so I guess you should be able to use JsPropertyMap<Object> and set int, float, double into it without them being auto boxed.

-- J.

[Vassilis Virvilis]

yep

that worked. thanks a bunch.

I have seen the @DoNotAutoBox and I tried with Integer, Number, JsNumber.

Note: I can put int in the JsPropertyMap but I cannot read it back. So
I cast it to (double) and the then to (int). I believe that is because
JavaScript does not have int type.

thanks again.

On Wed, Aug 14, 2019 at 5:38 PM Jens <jens.ne...@gmail.com> wrote:
>
> JsPropertyMap.set(key, value) is marked with @DoNotAutoBox, so I guess you should be able to use JsPropertyMap<Object> and set int, float, double into it without them being auto boxed.
>
> -- J.
>

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Vassilis Virvilis

[Peter Donald]

On Thu, Aug 15, 2019 at 4:28 PM Vassilis Virvilis <vas...@gmail.com> wrote:

I have seen the @DoNotAutoBox and I tried with Integer, Number, JsNumber.

Note: I can put int in the JsPropertyMap but I cannot read it back. So
I cast it to (double) and the then to (int). I believe that is because
JavaScript does not have int type.

That is certainly an option but in some circumstances can lead to type issues when casting. I tend to prefer using Any to do these sorts of conversions. It is a little more verbose but it avoids any unexpected casting problems. I don't have the code in front of me but I believe there is a method like getAsAny("myprop") that works in this scenario

 

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Vassilis Virvilis

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Cheers,

Peter Donald

[Vassilis Virvilis]

thanks that worked too.

It is Js.asAny(@DonotAutobox Object o) which performs an unchecked cast below.

Thanks for tips.

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Vassilis Virvilis