Create 0380-insert-delete-getrandom-o1.js

Author: andynullwong

javascript/0380-insert-delete-getrandom-o1.js

@@ -0,0 +1,41 @@
+var RandomizedSet = function() {
+    this.set = new Set();
+};
+
+/** 
+ * @param {number} val
+ * @return {boolean}
+ */
+RandomizedSet.prototype.insert = function(val) {
+    if (!this.set.has(val)) {
+        this.set.add(val);
+        return true;
+    } else {
+        return false;
+    }
+};
+
+/** 
+ * @param {number} val
+ * @return {boolean}
+ */
+RandomizedSet.prototype.remove = function(val) {
+    return this.set.delete(val);
+};
+
+/**
+ * @return {number}
+ */
+RandomizedSet.prototype.getRandom = function() {
+    const keys = Array.from(this.set.keys());
+    const seed = Math.floor(Math.random() * keys.length);
+    return keys[seed];
+};
+
+/** 
+ * Your RandomizedSet object will be instantiated and called as such:
+ * var obj = new RandomizedSet()
+ * var param_1 = obj.insert(val)
+ * var param_2 = obj.remove(val)
+ * var param_3 = obj.getRandom()
+ */