KMap.isNotEmpty

lib/src/extension/map_extensions_mixin.dart

@@ -16,8 +16,12 @@ abstract class KMapExtensionsMixin<K, V> implements KMapExtension<K, V>, KMap<K,
     return value;
   }
 
+  @override
   KIterator<KMapEntry<K, V>> iterator() => entries.iterator();
 
+  @override
+  bool isNotEmpty() => !isEmpty();
+
   @override
   KMap<R, V> mapKeys<R>(R Function(KMapEntry<K, V>) transform) {
     var mapped = mapKeysTo(linkedMapOf<R, V>(), transform);

lib/src/k_map.dart

@@ -106,9 +106,6 @@ abstract class KMapExtension<K, V> {
   @nonNull
   V getValue(K key);
 
-  // TODO isNotEmpty
-  // TODO isNullOrEmpty
-  // TODO
   // TODO filter
   // TODO filterTo
   // TODO filterNot
@@ -119,6 +116,11 @@ abstract class KMapExtension<K, V> {
    */
   KIterator<KMapEntry<K, V>> iterator();
 
+  /**
+   * Returns `true` if this map is not empty.
+   */
+  bool isNotEmpty();
+
   // TODO plus
   // TODO minus
 

test/collection/map_extensions_test.dart

@@ -33,6 +33,26 @@ void main() {
     });
   });
 
+  group("isEmpty", () {
+    test("is empty", () {
+      expect(mutableMapOf({}).isEmpty(), true);
+      expect(emptyMap().isEmpty(), true);
+    });
+    test("is not empty", () {
+      expect(mutableMapOf({1: "a"}).isEmpty(), false);
+    });
+  });
+
+  group("isNotEmpty", () {
+    test("is empty", () {
+      expect(mutableMapOf({}).isNotEmpty(), false);
+      expect(emptyMap().isNotEmpty(), false);
+    });
+    test("is not empty", () {
+      expect(mutableMapOf({1: "a"}).isNotEmpty(), true);
+    });
+  });
+
   group("iterator", () {
     test("iterate", () {
       var iterator = pokemon.iterator();