adding map

Data-Structures/Map/Map.js

@@ -0,0 +1,26 @@
+//https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
+//The code creates a Map named map1 and sets key-value pairs ('a': 1, 'b': 2, 'c': 3). It 
+//retrieves and logs the value associated with key 'a', then updates it to 97. It logs the map's 
+//size (number of pairs) before and after deleting key 'b'. Expected output: 1, 97, 3, 2.
+
+const map1 = new Map();
+
+map1.set('a', 1);
+map1.set('b', 2);
+map1.set('c', 3);
+
+console.log(map1.get('a'));
+// Expected output: 1
+
+map1.set('a', 97);
+
+console.log(map1.get('a'));
+// Expected output: 97
+
+console.log(map1.size);
+// Expected output: 3
+
+map1.delete('b');
+
+console.log(map1.size);
+// Expected output: 2

Data-Structures/Map/Map.test.js

@@ -0,0 +1,33 @@
+describe('Map Operations', () => {
+ let map1;
+
+ beforeEach(() => {
+ map1 = new Map();
+ map1.set('a', 1);
+ map1.set('b', 2);
+ map1.set('c', 3);
+ });
+
+ it('should get the correct value for key "a" initially', () => {
+ const valueA = map1.get('a');
+ expect(valueA).toBe(1);
+ });
+
+ it('should update the value for key "a" to 97', () => {
+ map1.set('a', 97);
+ const updatedValueA = map1.get('a');
+ expect(updatedValueA).toBe(97);
+ });
+
+ it('should have a size of 3 initially', () => {
+ const initialSize = map1.size;
+ expect(initialSize).toBe(3);
+ });
+
+ it('should have a size of 2 after deleting key "b"', () => {
+ map1.delete('b');
+ const updatedSize = map1.size;
+ expect(updatedSize).toBe(2);
+ });
+ });
+