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: camelCase.rb
    path of file: ./repos/ruby2js/lib/ruby2js/filter
    
    the code of the file until where you have to start completion: require 'ruby2js'

# Note care is taken to run all the filters first before camelCasing.
# This ensures that Ruby methods like each_pair can be mapped to
# JavaScript before camelcas
    
      def camelCase(symbol)
        return symbol if ALLOWLIST.include?(symbol.to_s)

        should_symbolize = symbol.is_a?(Symbol)
        symbol = symbol
                  .to_s
                  .gsub(/(?!^)_[a-z0-9]/) {|match| match[1].upcase}
                  .gsub(/^(.*)$/) {|match| CAPS_EXCEPTIONS[match] || match }
        should_symbolize ? symbol.to_sym : symbol
      end