diff --git a/wc.rb b/wc.rb
index f6131e7..21bde5f 100644
--- a/wc.rb
+++ b/wc.rb
@@ -2,9 +2,6 @@
 
 require 'optparse'
 
-options, input_sources = parse_options
-input_stream_sources(input_sources, options)
-
 def parse_options
   options = {}
   OptionParser.new do |opts|
@@ -17,8 +14,8 @@ def parse_options
 end
 
 def input_stream_sources(input_sources, options)
-  total_stats = [0, 0, 0]
-  max_widths = [0, 0, 0]
+  total_stats = { lines: 0, words: 0, bytes: 0 }
+  max_widths = { lines: 0, words: 0, bytes: 0 }
 
   input_sources.each do |source|
     stats = input_stream(source)
@@ -40,29 +37,29 @@ def input_stream(source)
 end
 
 def count_file_stats(input)
-  lines = words = bytes = 0
+  stats = { lines: 0, words: 0, bytes: 0 }
   input.each_line do |line|
-    lines += 1
-    words += line.split.size
-    bytes += line.bytesize
+    stats[:lines] += 1
+    stats[:words] += line.split.size
+    stats[:bytes] += line.bytesize
   end
-  [lines, words, bytes]
+  stats
 end
 
 def update_totals(totals, stats)
-  totals.zip(stats).map { |total, stat| total + stat }
+  totals.merge(stats) { |_key, total, stat| total + stat }
 end
 
 def update_max_widths(max_widths, stats)
-  max_widths.zip(stats).map { |max, stat| [max, stat.to_s.length].max }
+  max_widths.merge(stats) { |_key, max, stat| [max, stat.to_s.length].max }
 end
 
 def format_result(stats, max_widths, options)
-  result = []
-  %i[lines words bytes].each_with_index do |key, index|
-    result << stats[index].to_s.rjust(max_widths[index]) if options[key]
+  result = {}
+  %i[lines words bytes].each do |key|
+    result[key] = stats[key].to_s.rjust(max_widths[key]) if options[key]
   end
-  result.join(' ')
+  result.values.join(' ')
 end
 
 def print_result(result, source)
@@ -73,3 +70,6 @@ def print_total(total_stats, max_widths, options)
   total_result = format_result(total_stats, max_widths, options)
   puts "#{total_result} 合計"
 end
+
+options, input_sources = parse_options
+input_stream_sources(input_sources, options)