Merge pull request #80 from acherkashyn/map_none_all_any

Add KtMap methods none(), all() and any()
passsy · Feb 20, 2019 · 328b919 · 328b919
2 parents 05264f6 + 90e284d
commit 328b919
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diff --git a/lib/src/collection/extension/map_extensions_mixin.dart b/lib/src/collection/extension/map_extensions_mixin.dart
@@ -178,6 +178,57 @@ abstract class KtMapExtensionsMixin<K, V>
     entries.forEach((entry) => action(entry.key, entry.value));
   }
 
+  @override
+  bool none(Function(K key, V value) predicate) {
+    assert(() {
+      if (predicate == null) throw ArgumentError("predicate can't be null");
+      return true;
+    }());
+    if (isEmpty()) {
+      return true;
+    }
+    for (KtMapEntry<K, V> entry in entries.iter) {
+      if (predicate(entry.key, entry.value)) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  @override
+  bool all(Function(K key, V value) predicate) {
+    assert(() {
+      if (predicate == null) throw ArgumentError("predicate can't be null");
+      return true;
+    }());
+    if (isEmpty()) {
+      return true;
+    }
+    for (KtMapEntry<K, V> entry in entries.iter) {
+      if (!predicate(entry.key, entry.value)) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  @override
+  bool any(Function(K key, V value) predicate) {
+    assert(() {
+      if (predicate == null) throw ArgumentError("predicate can't be null");
+      return true;
+    }());
+    if (isEmpty()) {
+      return false;
+    }
+    for (KtMapEntry<K, V> entry in entries.iter) {
+      if (predicate(entry.key, entry.value)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
   @override
   String toString() {
     return entries.joinToString(

diff --git a/lib/src/collection/kt_map.dart b/lib/src/collection/kt_map.dart
@@ -261,4 +261,22 @@ abstract class KtMapExtension<K, V> {
    * [action] must not be null.
    */
   void forEach(Function(K key, V value) action);
+
+  /**
+   * Returns `true` if there is no entries in the map that match the given [predicate].
+   * [predicate] must not be null.
+   */
+  bool none(Function(K key, V value) predicate);
+
+  /**
+   * Returns true if all entries match the given [predicate].
+   * [predicate] must not be null.
+   */
+  bool all(Function(K key, V value) predicate);
+
+  /**
+   * Returns true if there is at least one entry that matches the given [predicate].
+   * [predicate] must not be null.
+   */
+  bool any(Function(K key, V value) predicate);
 }
diff --git a/test/collection/map_extensions_test.dart b/test/collection/map_extensions_test.dart
@@ -494,6 +494,80 @@ void testMap(KtMap<K, V> Function<K, V>() emptyMap,
       expect(e.message, allOf(contains("null"), contains("action")));
     });
   });
+
+  group("none", () {
+    test("none() non-empty map", () {
+      final map = mapFrom({
+        1: "Bulbasaur",
+        2: "Ivysaur",
+        3: "Stegosaur",
+      });
+      expect(map.none((key, value) => key == 1 && value == "Bulbasaur"), false);
+      expect(map.none((_, value) => value == "Random text"), true);
+    });
+
+    test("none() empty map", () {
+      final map = emptyMap();
+      expect(map.none((key, value) => key == 1 && value == "Bulbasaur"), true);
+      expect(map.none((key, value) => false), true);
+    });
+
+    test("predicate must be non null", () {
+      final e =
+          catchException<ArgumentError>(() => emptyMap().none(null));
+      expect(e.message, allOf(contains("null"), contains("predicate")));
+    });
+  });
+
+  group("all", () {
+    test("all() non-empty map", () {
+      final map = mapFrom({
+        1: "Bulbasaur",
+        2: "Ivysaur",
+        3: "Stegosaur",
+      });
+      expect(map.all((key, value) => key > 0 && value.contains("aur")), true);
+      expect(map.all((key, value) => value == "Bulbasaur"), false);
+      expect(map.all((key, value) => value.isNotEmpty), true);
+    });
+
+    test("all() empty map", () {
+      final map = emptyMap();
+      expect(map.none((key, value) => key == 1 && value == "Bulbasaur"), true);
+      expect(map.none((key, value) => false), true);
+    });
+
+    test("predicate must be non null", () {
+      final e =
+          catchException<ArgumentError>(() => emptyMap().all(null));
+      expect(e.message, allOf(contains("null"), contains("predicate")));
+    });
+  });
+
+  group("any", () {
+    test("any() non-empty map", () {
+      final map = mapFrom({
+        1: "Bulbasaur",
+        2: "Ivysaur",
+        3: "Stegosaur",
+      });
+      expect(map.any((key, value) => value == "Bulbasaur"), true);
+      expect(map.any((key, _) => key == -35), false);
+    });
+
+    test("any() empty map", () {
+      final map = emptyMap();
+      expect(map.any((key, value) => key == 1 && value == "Bulbasaur"), false);
+      expect(map.any((key, value) => true), false);
+      expect(map.any((key, value) => false), false);
+    });
+
+    test("predicate must be non null", () {
+      final e =
+          catchException<ArgumentError>(() => emptyMap().any(null));
+      expect(e.message, allOf(contains("null"), contains("predicate")));
+    });
+  });
 }
 
 class ThirdPartyMap<K, V>