Re: Obj-C idioms for list based tasks
Re: Obj-C idioms for list based tasks
- Subject: Re: Obj-C idioms for list based tasks
- From: Jens Alfke <email@hidden>
- Date: Mon, 7 Apr 2008 07:48:30 -0700
On 7 Apr '08, at 5:33 AM, Paul Sargent wrote:
Can anybody suggest a good way to:
1) Given an ordered set of objects, create a new non-mutable ordered
set,
with all the duplicates removed?
2) Given an ordered set of objects, create a new non-mutable ordered
set,
with each entry being the output of a method applied to each entry
of the
original array (e.g. Python map())?
No, there's nothing like that built-in, unfortunately.
Are there any ObjC shortcuts when doing things like this? Am I best
writing
a category on top of NSArray the encompass these (and other)
patterns? I'd
like to retain ordering, so using NSSet for (1) seems counter
productive.
Category methods would be a clean way to do it; just put a prefix on
your method names so they won't conflict with any methods Apple adds
in the future.
The only nontrivial thing about implementing these is performance, and
that's only an issue if you work on huge arrays.
—Jens
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