enumerable - Is there an inverse 'member?' method in ruby?

Question

I often find myself checking if some value belongs to some set. As I understand, people normally use Enumerable#member? for this.

end_index = ['.', ','].member?(word[-1]) ? -3 : -2

However, this feels a little less elegant than most of things in Ruby. I'd rather write this code as

end_index = word[-1].is_in?('.', ',') ? -3 : -2

but I fail to find such method. Does it even exist? If not, any ideas as to why?

Answer 1

Not in ruby but in ActiveSupport:

characters = ["Konata", "Kagami", "Tsukasa"]
"Konata".in?(characters) # => true