added:solution for Coding Interview Prep/Data Structures-Create a Map Data Structure (#38337)

* add: solution to Data Structures-Create a Map Data Structure

* Proper usage of -hasOwnProperty

removed unnecessary returns

curriculum/challenges/english/08-coding-interview-prep/data-structures/create-a-map-data-structure.english.md

@@ -70,7 +70,41 @@ var Map = function() {
 <section id='solution'>
 
 ```js
-// solution required
+var Map = function() {
+    this.collection = {};
+    // change code below this line
+
+    this.add = function(key,value) {
+      this.collection[key] = value;
+    }
+
+    this.remove = function(key) {
+      delete this.collection[key];
+    }
+
+    this.get = function(key) {
+      return this.collection[key];
+    }
+
+    this.has = function(key) {
+      return this.collection.hasOwnProperty(key)
+    }
+
+    this.values = function() {
+      return Object.values(this.collection);
+    }
+
+    this.size = function() {
+      return Object.keys(this.collection).length;
+    }
+
+    this.clear = function() {
+      for(let item of Object.keys(this.collection)) {
+        delete this.collection[item];
+      }
+    }
+    // change code above this line
+};
 ```
 
 </section>