Use readLines

02/day2.dart

@@ -0,0 +1,64 @@
+import 'dart:io';
+
+import 'package:dart_kollection/dart_kollection.dart';
+
+int checksum(KList<String> listIds) {
+  final boxes = listIds.map((id) => Box(id));
+
+  var doubles = 0;
+  var triples = 0;
+  for (final box in boxes.iter) {
+    if (box.withDoubles) doubles++;
+    if (box.withTriples) triples++;
+  }
+  return doubles * triples;
+}
+
+class Box {
+  final String id;
+  bool withDoubles;
+  bool withTriples;
+
+  Box(this.id) {
+    final chars = listOf(id.codeUnits);
+    final groups =
+        chars.groupBy((it) => it).mapValues((entry) => entry.value.size);
+    withDoubles = groups.containsValue(2);
+    withTriples = groups.containsValue(3);
+  }
+}
+
+KPair<String, String> fabricPairs(KList<String> boxIds) {
+  for (final id1 in boxIds.iter) {
+    for (final id2 in boxIds.iter) {
+      if (id1 == id2) continue;
+      var diff = 0;
+      for (var i = 0; i < id1.length; i++) {
+        if (diff > 1) break;
+        if (id1[i] != id2[i]) {
+          diff++;
+        }
+      }
+      if (diff == 1) {
+        return KPair(id1, id2);
+      }
+    }
+  }
+  throw "not found";
+}
+
+String commonLetters(KPair<String, String> pair) {
+  var c1 = listOf(pair.first.runes);
+  var c2 = listOf(pair.second.runes);
+  return String.fromCharCodes(c1.filter((it) => c2.contains(it)).iter);
+}
+
+main() {
+  KList<String> input = listOf(File("02/input.txt").readAsLinesSync());
+
+  print("checksum: ${checksum(input)}");
+
+  final pair = fabricPairs(input);
+  print("boxes with fabric: $pair");
+  print("common letters: ${commonLetters(pair)}");
+}

02/day2_test.dart

@@ -0,0 +1,38 @@
+import 'package:dart_kollection/dart_kollection.dart';
+import 'package:test/test.dart';
+
+import 'day2.dart';
+
+main() {
+  group("part1", () {
+    test('box has no doubles', () {
+      expect(Box("abcdef").withDoubles, false);
+    });
+    test('box has no triples', () {
+      expect(Box("abcdef").withTriples, false);
+    });
+    test('box has doubles', () {
+      expect(Box("bababc").withDoubles, true);
+    });
+    test('box has triples', () {
+      expect(Box("bababc").withTriples, true);
+    });
+  });
+  group("part2", () {
+    test('checksum sample', () {
+      var ids = listOf([
+        "abcdef",
+        "bababc",
+        "abbcde",
+        "abcccd",
+        "aabcdd",
+        "abcdee",
+        "ababab"
+      ]);
+      expect(checksum(ids), 12);
+    });
+    test('common letters sample', () {
+      expect(commonLetters(KPair("fghij", "fguij")), "fgij");
+    });
+  });
+}

02/input.txt

@@ -0,0 +1,250 @@
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pubspec.yaml

@@ -9,5 +9,6 @@ environment:
 
 dependencies:
   test: ^1.0.0
+  dart_kollection: ^0.1.0
 
 dev_dependencies: