From 8e9717cd1b1468fc2c281cf7fff7e2232e9d9030 Mon Sep 17 00:00:00 2001
From: omkar hole <omkarhole314@gmail.com>
Date: Sat, 27 Dec 2025 23:23:47 +0530
Subject: [PATCH 1/2] Create update.md

---
 .../dart/concepts/map/terms/update/update.md  | 98 +++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 content/dart/concepts/map/terms/update/update.md

diff --git a/content/dart/concepts/map/terms/update/update.md b/content/dart/concepts/map/terms/update/update.md
new file mode 100644
index 00000000000..c91c9ab2cbb
--- /dev/null
+++ b/content/dart/concepts/map/terms/update/update.md
@@ -0,0 +1,98 @@
+---
+Title: '.update()'
+Description: 'Updates the value for a specific key in a Map using a provided function.'
+Subjects:
+  - 'Computer Science'
+  - 'Code Foundations'
+Tags:
+  - 'Dart'
+  - 'Methods'
+  - 'Map'
+CatalogContent:
+  - 'learn-dart'
+  - 'paths/computer-science'
+---
+
+In Dart, the **`.update()`** method is used to update the value for a specific key in a `Map`. It takes a key and a function that computes the new value based on the existing value. If the key does not exist, an optional `ifAbsent` function can be provided to add a new key-value pair.
+
+## Syntax
+
+```pseudo
+mapVariable.update(key, (value) => newValue)
+```
+
+- `mapVariable`: The `Map` to be updated.
+- `key`: The key whose value needs to be updated.
+- `value`: The current value associated with the key.
+- `newValue`: The new value to replace the existing value.
+
+An optional `ifAbsent` parameter can be used to add a key if it does not exist:
+
+```pseudo
+mapVariable.update(key, (value) => newValue, ifAbsent: () => defaultValue)
+```
+
+- `ifAbsent`: A function that returns a default value if the key is not found.
+
+## Example 1
+
+In the following example, the `.update()` method is used to update the value for an existing key in a `Map`:
+
+```dart
+void main() {
+  Map<String, int> fruits = {'Apple': 5, 'Banana': 3};
+
+  // Update the value for 'Apple'
+  fruits.update('Apple', (value) => value + 2);
+
+  print(fruits);
+}
+```
+
+Here is the output for the above example:
+
+```shell
+{Apple: 7, Banana: 3}
+```
+
+## Example 2
+
+The `.update()` method can use the `ifAbsent` parameter to add a key if it does not exist:
+
+```dart
+void main() {
+  Map<String, int> fruits = {'Apple': 5};
+
+  // 'Orange' does not exist, so ifAbsent adds it
+  fruits.update('Orange', (value) => value, ifAbsent: () => 10);
+
+  print(fruits);
+}
+```
+
+Here is the output for the above example:
+
+```shell
+{Apple: 5, Orange: 10}
+```
+
+## Example 3
+
+The `.update()` method can also work with different [data types](https://www.codecademy.com/resources/docs/dart/data-types) for keys and values:
+
+```dart
+void main() {
+  Map<int, String> students = {1: 'Alice', 2: 'Bob'};
+
+  // Update the value for key 1
+  students.update(1, (value) => '$value Smith');
+
+  print(students);
+}
+```
+
+Here is the output for the above example:
+
+```shell
+{1: Alice Smith, 2: Bob}
+```

From a89c3a7a0cbe9f9b34250d8cd1d7dacc2e2c1015 Mon Sep 17 00:00:00 2001
From: Omkar Hole <182200831+omkarhole@users.noreply.github.com>
Date: Sat, 27 Dec 2025 23:31:51 +0530
Subject: [PATCH 2/2] Update update.md

---
 content/dart/concepts/map/terms/update/update.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/content/dart/concepts/map/terms/update/update.md b/content/dart/concepts/map/terms/update/update.md
index c91c9ab2cbb..ab24a360395 100644
--- a/content/dart/concepts/map/terms/update/update.md
+++ b/content/dart/concepts/map/terms/update/update.md
@@ -2,8 +2,8 @@
 Title: '.update()'
 Description: 'Updates the value for a specific key in a Map using a provided function.'
 Subjects:
-  - 'Computer Science'
   - 'Code Foundations'
+  - 'Computer Science'
 Tags:
   - 'Dart'
   - 'Methods'
@@ -64,7 +64,7 @@ void main() {
   Map<String, int> fruits = {'Apple': 5};
 
   // 'Orange' does not exist, so ifAbsent adds it
-  fruits.update('Orange', (value) => value, ifAbsent: () => 10);
+  fruits.update('Orange', (value) => value + 5, ifAbsent: () => 10);
 
   print(fruits);
 }