Re: unsetting object property in AS2

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On Oct 20, 2007, at 12:03 AM, ekameleon wrote:

> Hello :)
>
> See the documentation of the Array class and the splice method :
>
> splice(startIndex:Number <00002026.html#419506>,
> [deleteCount:Number<00002026.html#419506>],
> [value:Object <00002035.html#421878>])
>
>
> The null value don't remove an item in the Array instances :) clean  
> only the
> value in the case :)
>
> If you use a property in an object use 'undefined' or 'delete' :
>
> var o = {} ;
> o.prop1 = 1 ;
> o.prop2 = 2 ;
> trace(o) ;
>
> for (var prop in o )
> {
>       trace( prop  + " : " + o[prop] ) ;
> }
>
> trace("--- remove prop1") ;
>
> trace( "remove prop1 : " + delete o.prop1 ) ;
>
> for (var prop in o )
> {
>       trace( prop  + " : " + o[prop] ) ;
> }
>
> ... If you want keep the property but this property not must be  
> enumerable
> in the for..in loop, use ASSetPropFlags :
>
> var o = {} ;
> o.prop1 = 1 ;
> o.prop2 = 2 ;
> trace(o) ;
>
> ASSetPropFlags(o, ["prop1"] , 1 ) ;
>
> // with the for..in
> for (var prop in o )
> {
>       trace( prop  + " : " + o[prop] ) ;
> }
>
> // but the property exist :
> trace(o.prop1 ) ;
>
>
> EKA+ :)
>
> 2007/10/19, Andrew Sinning <[email protected]>:
>>
>> A question in my sent box from when the list went down:
>>
>> I like to use the Object class as an index, but there doesn't  
>> appear to
>> be a way to completely remove a property from an object.  I can  
>> set the
>> value to null, but I'd really like to be able to remove the property
>> completely.  Why? Because if I want to do a reverse lookup, then I  
>> have
>> to iterate through all of the properties, but having to iterate  
>> through
>> the nulled values seems inefficient.
>>
>> I can do this with another class, something that includes an Array to
>> keep track of current properties and an Object for the index, but I'm
>> wondering if I'm overlooking something.  Often I find that I am.
>>
>> Speaking of Arrays, it's a bit frustrating that there's no easy  
>> way to
>> remove an item from an array either.  Currently I use:
>>
>>    iterate through the array to find the index of the needle
>>    splice the Array at the index
>>
>> Is there a faster way to remove an item from an array?
>>
>>
>> Thanks!
>> _______________________________________________
>> Flashcoders mailing list
>> [email protected]
>> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
>>
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