On May 25, 2010, at 9:49 AM, Michael A. Crawford wrote:
>// If the array is empty, throw an exception. The caller should know
> better.
>// If there is only one, return object zero every time.
>// If there are only two, alternate with every access.
>// If there are three or more
On May 25, 2010, at 11:49 AM, Michael A. Crawford wrote:
>// If the array is empty, throw an exception. The caller should know
> better.
>// If there is only one, return object zero every time.
>// If there are only two, alternate with every access.
>// If there are three or mor
If this is indeed the desired effect, you're much better off writing a -
(NSArray *)arrayByRandomlyOrderingObjects in an NSArray category, and then
calling [[mySet allObjects] arrayByRandomlyOrderingObjects];.
Bob
On 25 May 2010, at 17:54, Dave DeLong wrote:
> Ah, I see; you don't want to pro
Since an NSSet is, by definition, unordered, the allObjects method is not
guaranteed to return the same ordering of objects every time. However, once
you have the array, you could easily order it yourself using
sortedArrayUsing(Selector/Comparator/Descriptors):.
And I've used this code (or rea
Implementation should probably include various options for what kind of pseudo
randomness is desired.
On May 25, 2010, at 11:52 AM, Dave DeLong wrote:
> What about something like:
>
> @implementation NSSet (Random)
>
> - (id) randomObject {
> NSArray * allObjects = [self allObjects];
> if ([
Hey, not bad. Does the -allObjects method always return the same sequence?
Did you just cobble this up or is this running in a system somewhere? It
doesn't do everything I want but it is definitely the better part of the 80/20
rule.
-Michael
On May 25, 2010, at 12:52 PM, Dave DeLong wrote:
Ah, I see; you don't want to provide the same object twice in a row. If
that's the case, is it really "random"? ;)
Dave
On May 25, 2010, at 10:52 AM, Dave DeLong wrote:
> What about something like:
>
> @implementation NSSet (Random)
>
> - (id) randomObject {
> NSArray * allObjects = [self
What about something like:
@implementation NSSet (Random)
- (id) randomObject {
NSArray * allObjects = [self allObjects];
if ([allObjects count] == 0) { @throw ...; }
return [allObjects objectAtIndex:(arc4random() % [allObjects count])];
}
@end
On May 25, 2010, at 10:49 AM, Michael A. Cra
I'd like to extend Apple implementation of NSMutableSet to include a
randomObject method. The purpose of this method is self-explanatory and its
potential use is I'm sure obvious to most of you.
For my first idea I thought about simply adding a category to NSMutableSet but
any obvious implemen
