[2023][ruby][1.*]

2023/ruby/.ruby-version

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+3.2

2023/ruby/Gemfile

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+source "https://rubygems.org"
+
+gem "minitest"
+gem "rake"

2023/ruby/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    minitest (5.20.0)
+    rake (13.1.0)
+
+PLATFORMS
+  arm64-darwin-22
+
+DEPENDENCIES
+  minitest
+  rake
+
+BUNDLED WITH
+   2.4.1

2023/ruby/day_01.rb

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+lines = ARGF.readlines(chomp: true)
+
+# part one
+p lines
+  .map { _1.chars.select {|c| c =~ /\d/ }}
+  .map { _1.values_at(0, -1) }
+  .sum { _1.join.to_i }
+
+# part two
+spellings = %w[
+  one two three four five six seven eight nine
+].each.with_index.to_h { [_1, _2 + 1] }
+digits = (spellings.keys + spellings.values).join(?|)
+first_re = /(#{digits})(?~#{digits})/
+last_re = /.*(#{digits})/
+
+p lines
+  .sum { |line|
+    [first_re, last_re]
+      .map { _1.match(line)[1] }
+      .map { spellings.fetch(_1, &:to_i) }
+      .join
+      .to_i
+  }