You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: node.rb
    path of file: ./repos/rb-libsvm/lib/libsvm
    
    the code of the file until where you have to start completion: module Libsvm
  # This class represents a feature.
  #
  # A feature has an index and a value.
  #
  # An array of features (Libsvm::Node instances) represents an
  # example which can be classified, or in greater number can
  # constitute the main part of a training set (Libsvm::Prolem).
  #
  # This class represents t
    
      def features(*vargs)
        array_of_nodes = []
        if vargs.size == 1
          argument = vargs.first
          if argument.class == Array
            case argument.first
            when Array
              argument.each do |pair|
                array_of_nodes << Node.new(pair.first.to_i, pair.last.to_f)
              end
            else
              argument.each_with_index do |value, index|
                array_of_nodes << Node.new(index.to_i, value.to_f)
              end
            end