add solution for 384 in js

Author: limbowandering

solution/384.Shuffle an Array/Solution.js

@@ -0,0 +1,36 @@
+/**
+ * @param {number[]} nums
+ */
+const Solution = function(nums) {
+  this.nums = nums || [];
+};
+
+/**
+* Resets the array to its original configuration and return it.
+* @return {number[]}
+*/
+Solution.prototype.reset = function() {
+  return this.nums;
+};
+
+/**
+* Returns a random shuffling of the array.
+* @return {number[]}
+*/
+Solution.prototype.shuffle = function() {
+  let a = this.nums.slice();
+  for(let i = 0; i < a.length; i++){
+    let rand = Math.floor(Math.random() * (a.length - i)) + i;
+    let tmp = a[i];
+    a[i] = a[rand];
+    a[rand] = tmp;
+  }
+  return a;
+};
+
+/** 
+* Your Solution object will be instantiated and called as such:
+* var obj = Object.create(Solution).createNew(nums)
+* var param_1 = obj.reset()
+* var param_2 = obj.shuffle()
+*/