Data commit

Task/CUSIP/Ruby/cusip-1.rb

@@ -0,0 +1,38 @@
+#!/usr/bin/env ruby
+
+def check_cusip(cusip)
+  abort('CUSIP must be 9 characters') if cusip.size != 9
+
+  sum = 0
+  cusip.split('').each_with_index do |char, i|
+    next if i == cusip.size - 1
+    case
+    when char.scan(/\D/).empty?
+      v = char.to_i
+    when char.scan(/\D/).any?
+      pos = char.upcase.ord - 'A'.ord + 1
+      v = pos + 9
+    when char == '*'
+      v = 36
+    when char == '@'
+      v = 37
+    when char == '#'
+      v = 38
+    end
+
+    v *= 2 unless (i % 2).zero?
+    sum += (v/10).to_i + (v % 10)
+  end
+
+  check = (10 - (sum % 10)) % 10
+  return 'VALID' if check.to_s == cusip.split('').last
+  'INVALID'
+end
+
+CUSIPs = %w[
+  037833100 17275R102 38259P508 594918104 68389X106 68389X105
+]
+
+CUSIPs.each do |cusip|
+  puts "#{cusip}: #{check_cusip(cusip)}"
+end

Task/CUSIP/Ruby/cusip-2.rb

@@ -0,0 +1,11 @@
+TABLE = ("0".."9").chain("A".."Z", %w(* @ #)).zip(0..).to_h
+
+def valid_CUSIP?(str)
+  sum = str[0..-2].chars.each_slice(2).sum do |c1,c2|
+    TABLE[c1].divmod(10).sum + (TABLE[c2]*2).divmod(10).sum
+  end
+  str[-1].to_i == (10 - (sum % 10)) % 10
+end
+
+CUSIPs = %w(037833100 17275R102 38259P508 594918104 68389X106 68389X105)
+CUSIPs.each{|cusip| puts "#{cusip}: #{valid_CUSIP? cusip}"}