pwc019 solution in dart

2 files changed, 56 insertions, 0 deletions

diff --git a/challenge-019/pokgopun/dart/ch-1.dart b/challenge-019/pokgopun/dart/ch-1.dart
new file mode 100644
index 0000000000..a270979141
--- /dev/null
+++ b/challenge-019/pokgopun/dart/ch-1.dart
@@ -0,0 +1,19 @@
+final monthsWith31Days = const {
+  DateTime.january: 'January',
+  DateTime.march: 'March',
+  DateTime.may: 'May',
+  DateTime.july: 'July',
+  DateTime.august: 'August',
+  DateTime.october: 'October',
+  DateTime.december: 'December',
+};
+void main() {
+  int startY = 1900;
+  int endY = 2019;
+  for (var y = startY; y <= endY; y++) {
+    print("$y: ${monthsWith31Days.keys // use key which is month number to build DateTime
+        .where((m) => DateTime(y, m, 1).weekday == DateTime.friday) // filter in only when 1st of the month is friday
+        .map((m) => monthsWith31Days[m]) // map month number to month label
+        .join(", ")}");
+  }
+}
diff --git a/challenge-019/pokgopun/dart/ch-2.dart b/challenge-019/pokgopun/dart/ch-2.dart
new file mode 100644
index 0000000000..659d27d9bf
--- /dev/null
+++ b/challenge-019/pokgopun/dart/ch-2.dart
@@ -0,0 +1,37 @@
+void main(List<String> args) {
+  final int lw =
+      args.isNotEmpty && int.tryParse(args[0]) != null ? int.parse(args[0]) : 0;
+  final input =
+      '''Write a script that can wrap the given paragraph at a specified column using the greedy algorithm.''';
+  //Iterable<Match> matches = RegExp(r'(.+?(?:\s|\n|$))').allMatches(input);
+  final Iterable<Match> matches = RegExp(r'\S+').allMatches(input);
+  var buf = StringBuffer();
+  var sl = lw;
+  for (final Match m in matches) {
+    String w = m[0]!;
+    if (w.length + 1 > sl) {
+      /*
+      if (buf.isNotEmpty) {
+        print(buf);
+      }
+      buf.clear();
+      buf.write(w);
+      */
+      /**/
+      if (buf.isNotEmpty) {
+        buf.write('\n');
+      }
+      buf.write(w);
+      /**/
+      sl = lw - w.length;
+    } else {
+      if (buf.isNotEmpty) {
+        buf.write(' ');
+        sl--;
+      }
+      buf.write(w);
+      sl -= w.length;
+    }
+  }
+  print(buf);
+}