Path for values_at to include block predicate

values_at.rb

class Array
  def values_at(*args)
    arr = []
    each_index do |i|
      if args_include_index?(args, i) or (block_given? and yield(i))
        arr << self[i]
      end 
    end 

    arr
  end 

  private    
  def args_include_index?(args, i)
    args.each do |arg|
      if arg.respond_to?(:include?)
        return true if arg.include?(i)
      elsif arg.to_i == i
        return true
      end
    end

    false
  end
end