Here's what I found. If a property is getter, hasOwnProperty() behaves
differently in Flash and JS.
class ExampleClass
{
public function get prop():String
{
return "test";
}
}
var test:ExampleClass = new ExampleClass();
console.log(test.hasOwnProperty("prop"); //true in Flash, false in JS
console.log("prop" in test) //true in both
However, as you can see, the "in" keyword will behave the same in both.
I also discovered that hasOwnProperty() behaves differently in Flash and
JS, if the property is defined on a superclass.
class ExampleSuperClass
{
public var superProp:String = "test2";
}
class ExampleClass extends ExampleSuperClass
{
}
var test:ExampleClass = new ExampleClass();
console.log(test.hasOwnProperty("superProp"); //true in Flash, false in JS
console.log("superProp" in test) //true in both
Again, the "in" keyword to the rescue.
According to MDN, hasOwnProperty() does not walk up the prototype chain in
JS, but the "in" keyword does. Apparently, they both walk up the
inheritance chain in Flash.
- Josh
On Sat, Jan 7, 2017 at 1:36 PM, Alex Harui <aha...@adobe.com> wrote:
> What is a test case where Hasownproperty behaves differently between js
> and as?
>
> Sent from my LG G3, an AT&T 4G LTE smartphone
>
> ------ Original message------
> *From: *Josh Tynjala
> *Date: *Sat, Jan 7, 2017 11:12 AM
> *To: *dev@flex.apache.org;
> *Subject:*Re: [FlexJS] value.hasOwnProperty not working, maybe a bug
>
> I don't recall it being discouraged. I use it somewhat frequently with the
> Flash runtimes. Never had a situation where it failed on me.
>
> - Josh
>
> On Jan 7, 2017 9:42 AM, "Alex Harui" <aha...@adobe.com> wrote:
>
> > Also properties are made via object.de<http://object.de>fineproperty.
> > that may affect hasownproperty. I don't think there is a way around
> that.
> > Hasownproperty was discouraged in ActionScript for similar reasons, Iirc.
> >
> > Sent from my LG G3, an AT&T 4G LTE smartphone
> >
> > ------ Original message------
> > From: Carlos Rovira
> > Date: Sat, Jan 7, 2017 9:21 AM
> > To: dev@flex.apache.org;
> > Subject:Re: [FlexJS] value.hasOwnProperty not working, maybe a bug
> >
> > Hi Josh,
> >
> > many thanks, your workaround works, but it's a shame that
> "hasOwnProperty"
> > can't be used and does not be reliable :(
> >
> > Thanks!
> >
> > :)
> >
> >
> >
> > 2017-01-07 17:28 GMT+01:00 Josh Tynjala <joshtynj...@gmail.com>:
> >
> > > Are you testing a release build? Remember that Closure compiler renames
> > > member variables, so using a string to check if they exist won't work.
> > >
> > > It can be frustrating, I know. To this day, I still wish that this
> > drastic
> > > renaming with Closure hadn't been the default we chose. It breaks a
> > number
> > > of common things like this.
> > >
> > > You may be able to do something like this instead, I think:
> > >
> > > If(value.label !== undefined)
> > >
> > > JavaScript generally won't throw an error when you try to access a
> > property
> > > that doesn't exist because all JS objects are dynamic by default.
> > >
> > > - Josh
> > >
> > > On Jan 7, 2017 5:02 AM, "Carlos Rovira" <carlosrov...@apache.org>
> wrote:
> > >
> > > > Hi,
> > > >
> > > > I have this code in a Item Renderer:
> > > >
> > > > override public function set data(value:Object):void
> > > > {
> > > > super.data = value;
> > > >
> > > > if(value == null) return;
> > > >
> > > > /*if(value.hasOwnProperty('label')) {
> > > > label = String(value.label);
> > > > } else {
> > > > label = String(value);
> > > > }*/
> > > > label = String(value.label);
> > > >
> > > > /*if(value.hasOwnProperty('href')) {
> > > > href = String(value.href);
> > > > }*/
> > > > href = String(value.href);
> > > >
> > > > COMPILE::JS
> > > > {
> > > > if(textNode != null)
> > > > {
> > > > textNode.nodeValue = label;
> > > > }
> > > > }
> > > > }
> > > >
> > > > The commented code is not working. So I committed the line just below
> > to
> > > > get it working for now.
> > > >
> > > > I'm passing typed object in the dataProvider :
> > > >
> > > > package vos
> > > > {
> > > > public class NavigationLinkVO
> > > > {
> > > > [Bindable]
> > > > public var label:String;
> > > > [Bindable]
> > > > public var href:String;
> > > >
> > > > public function NavigationLinkVO(label:String, href:String)
> > > > {
> > > > this.label = label;
> > > > this.href = href;
> > > > }
> > > > }
> > > > }
> > > >
> > > > And the dataProvider is:
> > > >
> > > > private var _mainNavigation:Array = [
> > > > new NavigationLinkVO("About", "
> > > > https://getmdl.io/index.html
> > > > "),
> > > > new NavigationLinkVO("Getting Started", "
> > > > https://getmdl.io/started/index.html";),
> > > > new NavigationLinkVO("Components", "
> > > > https://getmdl.io/components/index.html";),
> > > > new NavigationLinkVO("Customize", "
> > > > https://getmdl.io/customize/index.html";)
> > > > ];
> > > >
> > > > So, "label" and "href" are properties in the object, so why
> > > > "hasOwnProperty" is not working? is a bug?
> > > >
> > > > Thanks
> > > >
> > > > --
> > > > Carlos Rovira
> > > > http://about.me/carlosrovira
> > > >
> > >
> >
> >
> >
> > --
> >
> > Carlos Rovira
> > Director General
> > M: +34 607 22 60 05
> > http://www.codeoscopic.com
> > http://www.avant2.es
> >
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