Obj-C idioms for list based tasks
Obj-C idioms for list based tasks
- Subject: Obj-C idioms for list based tasks
- From: "Paul Sargent" <email@hidden>
- Date: Mon, 7 Apr 2008 14:33:17 +0200
Coming from other object based languages I'm aware that each language can
have it's own idioms for common tasks. In particular coming from doing a lot
of python, I'm finding myself wanting to do a few things with NSArrays that
I would do quite easily with python lists.
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())?
I can easily write 'for each' loops that do these and create mutable arrays,
and then return non-mutable copies, but I half expect that these are common
patterns, and there might be a nice, concise, way of writing them.
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.
Thanks
P.S. Alternatively, Is there a site like
http://aspn.activestate.com/ASPN/Cookbook/Python/ for Objective C?
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