Add Dart Map .cast() term entry

Author: Muntazir-sd

content/dart/concepts/map/terms/cast/cast.md

@@ -0,0 +1,47 @@
+---
+Title: '.cast()'
+Description: 'Returns a new Map with the same entries but with different key and value types.'
+Subjects:
+  - 'Computer Science'
+  - 'Data Science'
+Tags:
+  - 'Dart'
+  - 'Map'
+  - 'Methods'
+CatalogContent:
+  - 'learn-dart'
+  - 'paths/computer-science'
+---
+
+In Dart, the **`.cast()`** method returns a new `Map` containing the same key–value pairs as the original map, but with the specified key and value types. The returned map performs type checks when accessing or modifying its entries.
+
+This method is commonly used when working with dynamically typed maps that need to be treated as a map with specific types.
+
+## Syntax
+
+```pseudo
+mapVariable.cast<NewKeyType, NewValueType>()
+```
+
+`mapVariable` is the `Map` object whose entries are cast to new types.
+
+## Example
+
+```dart
+void main() {
+  Map<dynamic, dynamic> rawData = {
+    'Alice': 90,
+    'Bob': 85,
+  };
+
+  Map<String, int> scores = rawData.cast<String, int>();
+
+  print(scores);
+}
+```
+
+**Output:**
+
+```shell
+{Alice: 90, Bob: 85}
+```