Yeah, that should be fine, but it's unnecessary.
You can just do:
NSArray *objectsArray = [theArray valueForKey:key];
And it'll do pretty much the same thing (except that it'll call -valueForKey:
on each item in the array, and not objectForKey:. However, if the objects are
NSDictionaries, that's pretty much the same thing).
Dave
On Jun 30, 2011, at 11:59 AM, JongAm Park wrote:
> Hello,
>
> I wrote a method for NSArray.
>
> - (NSArray *)objectsForKey:(id)key
> {
> NSMutableArray *objectsArray = [NSMutableArray arrayWithCapacity:10];
>
> for( id item in self )
> {
> [objectsArray addObject:[item objectForKey:key]];
> }
>
> return [[objectsArray copy] autorelease];
> }
>
> What I'm curious is if it is OK to use fast enumeration to implement an
> NSArray method itself.
> Because the mechanism for fast enumeration is already there, I basically
> think it will be OK.
> However, wouldn't it better to rely on the most fundamental mechanism like
> objectAtIndex:?
> I found someone's implementation here at
> http://svn.opengroupware.org/SOGo/inverse/trunk/SoObjects/SOGo/NSArray+Utilities.m
> Approaching such a way looks reasonable to me, because it should work
> whatever underlying mechanism is supported by Objective-C.
>
> Will there be any good/bad aspect in using fast enumeration in this case?
>
> Thank you.
>
>
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