Re: anyObject
Re: anyObject
- Subject: Re: anyObject
- From: Marco Scheurer <email@hidden>
- Date: Thu, 31 Jan 2002 18:15:24 +0100
On Thursday, January 31, 2002, at 05:52 pm, Robert Goldsmith wrote:
The "randomness" means there is no way to tel before which object will
be
returned, *NOT* that it would or should be a different one each time.
So the docs are misleading?
Yes
Ok, then if I want to select a random object from a set, what do you
suggest? I don't need the objects to be ordered in any way. Storing
them in an array then using a random number to access an index seems
silly when anyObject would have been such a good way to do it!
Why? It seems reasonbale to me. anyObject is useful when you need one
representant from the set, and there is no need to complicate it with a
pseudo random generator.
On the other side, you could implement your -randomObject method in a
category of NSArray, and there you go.
On the topic of having your items ordered or not. The true test on using
a Set is do you need (mathematical) set functionality? Or, on an array,
would you be calling often -indexOfObject: ? Otherwise, if you just need
any kind of storage for your objects, you are better of with NSArray: it
is faster and takes less memory.
Marco Scheurer
Sen:te, Lausanne, Switzerland
http://www.sente.ch
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| | >Re: anyObject (From: Robert Goldsmith <email@hidden>) |