[Ruby] String.include?([Array])

ruby_string_include_array.rb

# I find myself constantly wanting to check whether one string is included within an array of strings.
# It is certainly possible (and also fast) to do that in Ruby with something like this:  ["foo", "bar"].include?("foo")
# But I don't think it reads very nice :(
# Because what I actually want to test is, whether my string is included in the array and NOT the other way around.

# - Do you have the same problem?
# - What do you think about the following two solutions?

class String
  # create a new method
  def included_in?(array)
    array.include?(self)
  end

  # -- OR --

  # change the current String#include? method
  def include?(parameter)
    if parameter.is_a? Array
      parameter.include?(self)
    else
      super
    end
  end
end

I was looking for a solution to this problem for the same reason as you - pure code vanity :) I like the include_any? method but I think I will name mine in? so I could write it like "foo".in? %w(baz boo bar foo)

PS: you should think about submitting it as a patch for Ruby or Active Support

Thanks for your feedback. I gave it a try to submit it as a Ruby feature request: https://bugs.ruby-lang.org/issues/6365

Great idea!