dynapi-dev

SV: [Dynapi-Dev] deleteFromArray

[Bart B. <ba...@ho...>]

Actually, this is a pretty good idea.. then you could devise actual lists and stacks objects to work with.

-----Ursprungligt meddelande-----
Från: Brandon Myers <bnd...@ho...>
Till: dyn...@li... <dyn...@li...>
Datum: den 14 december 2000 23:30
Ämne: RE: [Dynapi-Dev] deleteFromArray


>I, in practice, when needing a name/value pair array... use objects.
>It's not good practice to use a for-in on an ordinal array.. and very poor
>practice to mix ordinal and associative arrays.. even though the language
>supports it. Just because a language supports something doesn't mean that
>it's a good thing to use.
>
>> -----Original Message-----
>> From: dyn...@li...
>> [mailto:dyn...@li...]On Behalf Of Scott Andrew
>> LePera
>> Sent: Thursday, December 14, 2000 2:15 PM
>> To: dyn...@li...
>> Subject: Re: [Dynapi-Dev] deleteFromArray
>>
>>
>> > hmm, so a delete array[element]  will leave a gap instead of
>> removing the
>> > element and move all "higher" elements down one step ?
>>
>> Yes, Brandon is correct in this.  That's one of the reasons why
>> removeFromArray was created in the first place.  It keeps ordinal arrays
>> in the correct order when you remove an element.
>>
>> --
>> scott andrew lepera
>> -----------------------------------
>> web stuff:     www.scottandrew.com
>> music stuff:   www.walkingbirds.com
>> _______________________________________________
>> Dynapi-Dev mailing list
>> Dyn...@li...
>> http://lists.sourceforge.net/mailman/listinfo/dynapi-dev
>
>_______________________________________________
>Dynapi-Dev mailing list
>Dyn...@li...
>http://lists.sourceforge.net/mailman/listinfo/dynapi-dev

SV: [Dynapi-Dev] deleteFromArray

[Bart B. <ba...@ho...>]

Well, you could do it an alternate way.
You could add a generic function to the Array object, for deleting items correctly.. i.e. deleting an item and redistributing the array by moving the adjacent items down a step.
Something like:

Array.prototype.deleteItem=function(item){ 
 for(var i=0,n=0;i<this.length;i++){  
  if(this[i]!=this[item]) this[n++]=this[i]  
 } 
 this.length=this.length-1  
}

/////////////////////////////////

var a=[1,2,3,4,5]
alert(a +"  "+a.length)
a.deleteItem(2)
alert(a +"  "+a.length)


Some extra work is needed for accociative arrays.. but this is a great way of extending Array functionality, and keeping functions dealing with "lists" and "stacks" general.

/ Bart

-----Ursprungligt meddelande-----
Från: Scott Andrew LePera <sc...@sc...>
Till: dyn...@li... <dyn...@li...>
Datum: den 14 december 2000 20:24
Ämne: Re: [Dynapi-Dev] deleteFromArray


>> hmm, so a delete array[element]  will leave a gap instead of removing the
>> element and move all "higher" elements down one step ?
>
>Yes, Brandon is correct in this.  That's one of the reasons why
>removeFromArray was created in the first place.  It keeps ordinal arrays
>in the correct order when you remove an element.
>
>-- 
>scott andrew lepera
>-----------------------------------
>web stuff:     www.scottandrew.com
>music stuff:   www.walkingbirds.com
>_______________________________________________
>Dynapi-Dev mailing list
>Dyn...@li...
>http://lists.sourceforge.net/mailman/listinfo/dynapi-dev