Merge pull request #2542 from aadil42/patch-44

Author: aakhtar3

javascript/0705-design-hashset.js

@@ -0,0 +1,41 @@
+// https://leetcode.com/problems/design-hashset
+class MyHashSet {
+    constructor() {
+        this.set = [];
+    }
+
+    /** 
+     * Time O(1) | Space O(1)
+     * @param {number} key
+     * @return {void}
+     */
+    add(key) {
+        this.set[key] = key;
+    }
+
+    /** 
+     * Time O(1) | Space O(1)
+     * @param {number} key
+     * @return {void}
+     */
+    remove(key) {
+        this.set[key] = undefined;
+    }
+
+    /** 
+     * Time O(1) | Space O(1)
+     * @param {number} key
+     * @return {boolean}
+     */
+    contains(key) {
+        return this.set[key] !== undefined;
+    }
+}
+
+/** 
+ * Your MyHashSet object will be instantiated and called as such:
+ * var obj = new MyHashSet()
+ * obj.add(key)
+ * obj.remove(key)
+ * var param_3 = obj.contains(key)
+ */