Re: Why add a nil item to an NSArray ?
Re: Why add a nil item to an NSArray ?
- Subject: Re: Why add a nil item to an NSArray ?
- From: Bill Cheeseman <email@hidden>
- Date: Mon, 27 Jun 2005 17:42:34 -0400
on 2005-06-27 3:23 PM, Dave Hersey at email@hidden wrote:
> Because... That's the spec for the method.
>
>> - (id)initWithObjects:(id)anObject...
>> Initializes a newly allocated set with members taken from the specified list
>> of objects. initWithObjects: takes a comma-separated list of objects
>> terminated by nil...
Among other things, this is a trap for the unwary. When you construct an
array as specified, but one of the objects in the list before the explicit
nil happens to be nil at run time, the array constructor will dutifully
terminate construction of the array, possibly omitting objects after it in
the list. If any item in the list can be nil at run time, you must guard
against this.
--
Bill Cheeseman - email@hidden
Quechee Software, Quechee, Vermont, USA
http://www.quecheesoftware.com
PreFab Software - http://www.prefab.com/scripting.html
The AppleScript Sourcebook - http://www.AppleScriptSourcebook.com
Vermont Recipes - http://www.stepwise.com/Articles/VermontRecipes
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