```ruby
# frozen_string_literal: true
require 'facets/hash/collate'

module SensitiveDataFilter
  module Middleware
    class ParameterScanner
      def initialize(env_parser)
        @env_parser = env_parser
        @params     = @env_parser.query_params.flatten + @env_parser.body_params.flatten
        @scans      = @params.map { |value| SensitiveDataFilter::Scan.new(value) }
      end

      def matches
        @scans.map(&:matches).inject(:collate)
      end

      def sensitive_data?
        @scans.any?(&:matches?)
      end
    end
  end
end
```

Use local where instance variable not needed
user
```ruby
# frozen_string_literal: true
require 'facets/hash/collate'

module SensitiveDataFilter
  module Middleware
    class ParameterScanner
      def initialize(env_parser)
        @env_parser = env_parser
        params = @env_parser.query_params.flatten + @env_parser.body_params.flatten
        @scans = params.map { |value| SensitiveDataFilter::Scan.new(value) }
      end

      def matches
        @scans.map(&:matches).inject(:collate)
      end

      def sensitive_data?
        @scans.any?(&:matches?)
      end
    end
  end
end
```
assistant