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Big-O of ReadOnlyCollection<T>.Last?

sfun28
sfun28 asked
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Last Modified: 2013-11-11
Folks,

What's the Big-O of ReadOnlyCollection<T>.Last (Linq extension method)?
I'm hoping o(1), but I can't tell from the documentation.

It seems the linq extension is on IEnumerable...but perhaps it leverages the underlying IList for faster access?  I have no clue.
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Top Expert 2009
Commented:
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Commented:
Wow!!!  Thanks so much!  This was one of the most complete answers I've ever gotten.  Great idea to examine this in reflector...I wouldn't have thought about that.
Top Expert 2009

Commented:
compliments like that should be in the open, don't you think? if you don't mind, I copy it here so others can see it too (yes, I know, I'm egocentric! lol ;-)

(from grading comment)
Wow!!! Thanks so much! This was one of the most complete answers I've ever gotten. Great idea to examine this in reflector...I wouldn't have thought about that.
Tx for the great compliment and glad to have been of help! :)

Author

Commented:
Out of curiosity, is the code reference something you just copied/pasted from reflector?
Top Expert 2009

Commented:
Yes, I just pasted that from Reflector, nothing of it is my own. That also means, that the code is not exactly the same as the Shared Source Code from Microsoft that you get into when you are debugging. But the Shared Source Code is protected by copyright law, but reflected assembly is not.

There is a small mishap in my story. It doesn't change anything, but the story above might be understood as that IList and IList<T> are the same. System.Array implements IList and ReadOnlyCollection implements both IList<T> and IList. For the functionality in the code above this doesn't make any difference as an Array / IList can be cast to IList<T>.

-- Abel --


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Commented:
Thanks!!!  Great explanation!
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