v1.4.2

- Added the `isLeapYear` extension to the `DateTime` and `int` objects.
- Added the `FixedSizeList` class.

lib/src/classes/fixed_size_list.dart

@@ -0,0 +1,29 @@
+/// Represents a `List` with a fixed capacity.
+///
+/// When a new element is added and the list reaches its maximum capacity,
+/// the oldest element in the list is automatically removed to make space.
+class FixedSizeList {
+  final int _capacity;
+  final List<String> _list;
+
+  /// Creates a [FixedSizeList] with the specified [capacity].
+  ///
+  /// The initial list will be empty.
+  FixedSizeList(this._capacity) : _list = <String>[];
+
+  /// Adds a new [element] to the list.
+  ///
+  /// If the list is already at its maximum [capacity], the oldest element
+  /// will be removed before the new [element] is added.
+  void add(String element) {
+    _list.add(element);
+    if (_list.length > _capacity) {
+      _list.removeAt(0);
+    }
+  }
+
+  /// Returns an unmodifiable view of the current items in the list.
+  ///
+  /// This prevents external modification of the internal list.
+  List<String> get items => List.unmodifiable(_list);
+}

lib/src/extensions/date_time.dart

@@ -1,5 +1,3 @@
-import "package:week_number/iso.dart";
-
 /// An extension on `DateTime` to get the start and end of various time periods.
 extension StartAndEndOfPeriod on DateTime {
   /// Returns a `DateTime` object representing the start of the hour.
@@ -141,3 +139,17 @@ extension YesterdayAndTomorrow on DateTime {
   DateTime get tomorrow =>
       DateTime.now().add(const Duration(days: 1)).startOfDay;
 }
+
+extension IsLeapYear on DateTime {
+  /// Returns `true` if the year is a leap year, otherwise returns `false`.
+  bool get isLeapYear => year.isLeapYear;
+}
+
+extension IsIntLeapYear on int {
+  /// Returns `true` if the given value would be considered a leap year,
+  /// otherwise returns `false`.
+  bool get isLeapYear =>
+      !this.isNegative &&
+      this > 0 &&
+      ((this * 1073750999) & 3221352463) <= 126976;
+}