Ruby: Is there an opposite of include? for Ruby Arrays?

if @players.exclude?(p.name)
    ...
end

ActiveSupport adds the exclude? method to Array, Hash, and String. This is not pure Ruby, but is used by a LOT of rubyists.

Source: Active Support Core Extensions (Rails Guides)

Here you go:

unless @players.include?(p.name)
  ...
end

You might have a look at the Ruby Style Guide for more info on similar techniques.

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