commit 28cacbd5d6a606a67e7f7c6889b11161b6f8bf94
Author: Guido Schweizer <guido.schweizer@posteo.de>
Date:   Fri Dec 1 10:00:04 2023 +0100

    day1 complete

diff --git a/day_1/data b/day_1/data
new file mode 100644
index 0000000..25e1cf1
--- /dev/null
+++ b/day_1/data
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\ No newline at end of file
diff --git a/day_1/impl.rb b/day_1/impl.rb
new file mode 100644
index 0000000..a2a657a
--- /dev/null
+++ b/day_1/impl.rb
@@ -0,0 +1,19 @@
+#prepare the input which is a string containing new lines
+def parse(input)
+  data = []
+  input.each_line do |line|
+    data << line.gsub(/[a-zA-Z]/,"").chomp
+  end
+  data
+end
+
+# result should a single string or integer
+def calculate(data)
+  result = 0
+  data.each do |d|
+    d = d.chars.to_a
+    num = "#{d.first}"+"#{d.last}"
+    result += num.to_i
+  end
+  result
+end
diff --git a/day_1/impl_2.rb b/day_1/impl_2.rb
new file mode 100644
index 0000000..33979be
--- /dev/null
+++ b/day_1/impl_2.rb
@@ -0,0 +1,44 @@
+MAPPER = {
+  "8": "eight",
+  "7": "seven",
+  "3": "three",
+  "9": "nine",
+  "5": "five",
+  "4": "four",
+  "6": "six",
+  "2": "two",
+  "1": "one"
+}
+
+#prepare the input which is a string containing new lines
+def parse(input)
+  data = []
+  input.each_line do |line|
+    data << line.chomp
+  end
+  data
+end
+
+def find_first_digit(line, reverse:false)
+  line.length.times do |i|
+    j = reverse ? line.length - 1 - i : i
+    return line[j] if line[j].to_i != 0
+    sub_line = line[j..-1]
+    MAPPER.each do |k,v|
+      return k if sub_line.start_with?(v)
+    end
+  end
+end
+
+# result should a single string or integer
+def calculate(data)
+  result = 0
+  data.each_with_index do |d,i|
+    first = find_first_digit(d)
+    last = find_first_digit(d, reverse: true)
+
+    num = "#{first}"+"#{last}"
+    result += num.to_i
+  end
+  result
+end
diff --git a/day_1/run.rb b/day_1/run.rb
new file mode 100644
index 0000000..81932df
--- /dev/null
+++ b/day_1/run.rb
@@ -0,0 +1,24 @@
+if ARGV[0] == "2"
+  require_relative "impl_2"
+else
+  require_relative "impl"
+end
+
+
+def print(result)
+  if result.is_a? Array
+    result.map! {|l| "#{l}\n" } 
+  end
+  
+  puts result
+end
+
+def run
+  puts "running your implementation"
+  input = File.new("day_1/data").read
+  data = parse(input)
+  result = calculate(data)
+  print(result)
+end
+
+run
diff --git a/day_1/test.rb b/day_1/test.rb
new file mode 100644
index 0000000..2142af2
--- /dev/null
+++ b/day_1/test.rb
@@ -0,0 +1,41 @@
+if ARGV[0] == "2"
+  require_relative "impl_2"
+  RESULT = 281
+else
+  require_relative "impl"
+  RESULT = 142
+end
+
+
+INPUT = <<~IN
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet
+IN
+
+INPUT_2 = <<~IN
+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen
+IN
+
+def test_example
+  input = ARGV[0] == "2" ? INPUT_2 : INPUT
+  parsed = parse(input)
+  result = calculate(parsed)
+
+  if result == RESULT
+    puts "Test successful. Now run with real input"
+    puts "ruby day_1/run.rb #{ARGV[0]}"
+  else
+    puts "Test failed"
+    puts "expected \"#{RESULT}\" got \"#{result}\""
+  end
+end
+
+test_example