create 0706 in js

Author: Mohammed785

javascript/0706-design-hashmap.js

@@ -0,0 +1,37 @@
+var MyHashMap = function () {
+    this.map = new Map();
+};
+
+/**
+ * @param {number} key
+ * @param {number} value
+ * @return {void}
+ */
+MyHashMap.prototype.put = function (key, value) {
+    this.map.set(key, value);
+};
+
+/**
+ * @param {number} key
+ * @return {number}
+ */
+MyHashMap.prototype.get = function (key) {
+    const val = this.map.get(key);
+    return val !== undefined ? val : -1;
+};
+
+/**
+ * @param {number} key
+ * @return {void}
+ */
+MyHashMap.prototype.remove = function (key) {
+    this.map.delete(key);
+};
+
+/**
+ * Your MyHashMap object will be instantiated and called as such:
+ * var obj = new MyHashMap()
+ * obj.put(key,value)
+ * var param_2 = obj.get(key)
+ * obj.remove(key)
+ */