lib/vindetta/decoder.rb in vindetta-0.17.0 vs lib/vindetta/decoder.rb in vindetta-0.17.1

@@ -2,30 +2,32 @@
 require "net/http"
 require "json"
 
 module Vindetta
   class Decoder
+    CHECK_DIGIT_INDEX = 8
+
     def self.vin(vin)
       Result.new(Api.get(vin)["Results"])
     end
 
     def self.plant_code(vin)
       vin[10]
     end
 
     def self.check_digit(vin)
-      vin[8]
+      vin[CHECK_DIGIT_INDEX]
     end
 
     def self.wmi(vin)
       vin[0..2]
     end
 
     def self.vds(vin, options = {})
       defaults = { :check_digit => true }
       options = defaults.merge(options)
 
-      vin[3..8].tap do |vds|
+      vin[3..CHECK_DIGIT_INDEX].tap do |vds|
         vds.chop! unless options[:check_digit]
       end
     end
 
     def self.year(vin)