Hi guys!
Time to time I meet questions on SO about how to take elements from array avoid some indexes.
I think it might be helpful for many developers to have something like Hash#except but for Array.
I would like to add PR with it if someone interested in it.
Thanks in advance for any thoughts about this idea.
Would this alias Array#excluding? I think the Array#except is natural and I’ve found myself asking why it’s not aliased already many times but I’m not the one to ask. 
It wouldn’t be alias 
The main idea is to implement method which we can use to exclude elements from array by their indexes.
For example: %w( a b c d e f).except(0, -1)
=> [‘b’, ‘c’, ‘d’, ‘e’]
Nice suggestion! 
I see how it would replicate the Hash#except syntax as seen here: https://apidock.com/rails/Hash/except
However, could this be confusing for those who don’t anticipate the index stripping behavior but more of a reject/excluding behavior?
i.e.:
%w( 1 5 6 8 0 9 0 ).except(0)
#=> [5,6,8,0,9,0]
Would it be better to explicitly add the index to the name such as #except_index or more verbose #except_with_index ?
I’m totally agree that it might be confusing so yeah, maybe #except_index will be the best variant
What would be a typical use case for such a function - I can understand the special case of wanting to remove the first / last items in the array, but an arbitrary one?
I think your question is kinda abstractive because many Rails/Ruby methods is mostly for special cases and many of them might be not used ever by most of the projects.
I think there should be a lot of use cases. It’s not gonna be the fastest method, but it will be quite popular. From my side I implemented such a method and used it for complex data parsing. I would recommend to add ranges to arguments.
I opened PR: https://github.com/rails/rails/pull/38611