Add day 4 solutions.

day4.cr

@@ -1,49 +1,58 @@
 INPUT = File.read("day4.txt").lines.map(&.chomp) 
 
+def parse_passport(string)
+  new_hash = {} of String => String
+  string.split(" ").each do |field|
+    k,v = field.split(":")
+    new_hash[k] = v
+  end
+  new_hash
+end
+
+def parse_passports(lines)
+  passports = [] of Hash(String, String)
+  passport = [] of String
+
+  lines.each do |line|
+    unless line.empty?
+      passport << line
+      next
+    end
+
+    passports << parse_passport(passport.join(" "))
+    passport = [] of String
+  end
+  passports << parse_passport(passport.join(" "))
+end
+
 def part1
   input = INPUT.clone
-  passlines = [] of Array(String)
-  currpass = [] of String
-  input.each do |line|
-    if line.empty?
-      passlines << currpass
-      currpass = [] of String
-      next
+  passports = parse_passports(input)
+  total = passports.count do |passport|
+    ["byr", "iyr", "eyr", "hgt", "hcl", "ecl", "pid"].all? do |key|
+      passport.has_key? key
     end
-    currpass << line
   end
-  passlines << currpass
-
-  total = 0
-  passlines.each do |pass|
-    fields = pass.join(" ").split(" ")
-    puts fields
-    values = {} of String => String
-    fields.each do |field|
-      key = field.split(":")[0]
-      values[key] = field.split(":")[1]
-      puts "#{key}: #{values[key]}"
+  puts total
 end
 
-    next unless value = values["byr"]?
+def part2
+  input = INPUT.clone
+  passports = parse_passports(input)
+  total = passports.count do |passport|
+    next unless value = passport["byr"]?
     value = value.to_i32
     next unless value >= 1920 && value <= 2002
 
-    puts "byr"
-
-    next unless value = values["iyr"]?
+    next unless value = passport["iyr"]?
     value = value.to_i32
     next unless value >= 2010 && value <= 2020
   
-    puts "iry"
-
-    next unless value = values["eyr"]?
+    next unless value = passport["eyr"]?
     value = value.to_i32
     next unless value >= 2020 && value <= 2030
 
-    puts "eyr"
-
-    next unless value = values["hgt"]?
+    next unless value = passport["hgt"]?
     next unless value.ends_with?("cm") || value.ends_with?("in")
     ivalue = value[0..-3].to_i32
     if value.ends_with? "cm"
@@ -52,33 +61,20 @@ def part1
       next unless ivalue >= 59 && ivalue <= 76
     end
 
-    puts "hgt"
-
-    next unless value = values["hcl"]?
+    next unless value = passport["hcl"]?
     next unless value[0] == '#' && (value[1..]).to_i32(16)
 
-    puts "hcl"
-
-    next unless value = values["ecl"]?
+    next unless value = passport["ecl"]?
     next unless "amb blu brn gry grn hzl oth".split(" ").includes? value
 
-    puts "ecl"
-
-    next unless value = values["pid"]?
-    puts value
+    next unless value = passport["pid"]?
     next unless value.size == 9
     next unless value = value.to_i32?
   
-    puts "pid"
-
-    total += 1
+    true
   end
   puts total
 end
 
-def part2
-  input = INPUT.clone
-end
-
 part1
 part2