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lib/features/core/data/extensions/map_extensions.dart

@@ -1,3 +1,6 @@
 extension MapExtensions<A, B> on Map<A, B> {
   Map<A, B> get deepCopy => {...this};
+
+  /// Returns the values of a [Map] at given [keys] indices.
+  Iterable<B> valuesByKeys({required Iterable<A> keys}) => keys.map((final key) => this[key]!);
 }

lib/features/core/data/extensions/object_extensions.dart

@@ -0,0 +1,8 @@
+extension ObjectExtensions on Object? {
+  E asType<E>() => this as E;
+  E? asNullableType<E>() => this as E?;
+}
+
+extension AsCallback<T extends Object> on T {
+  T Function() get asCallback => () => this;
+}

lib/features/core/data/extensions/string_extensions.dart

@@ -0,0 +1,14 @@
+extension StringExtensions on String {
+  /// Returns true if given word contains atleast all the characters in [targetChars], and `false` otherwise
+  ///
+  /// Very efficient `O(n)` instead of naive `O(n*m)`
+  bool containsAllCharacters({required String targetChars}) {
+    final Set<String> characterSet = Set.from(targetChars.split(''));
+    for (final testChar in split('')) {
+      characterSet.remove(testChar);
+      if (characterSet.isEmpty) return true;
+    }
+
+    return false;
+  }
+}