solve: top k frequent elements

Author: wogha95

top-k-frequent-elements/wogha95.js

@@ -0,0 +1,19 @@
+// TC: O(n logn)
+// SC: O(N)
+
+/**
+ * @param {number[]} nums
+ * @param {number} k
+ * @return {number[]}
+ */
+var topKFrequent = function (nums, k) {
+  const numAndCountBoard = nums.reduce((result, current) => {
+    result[current] = result.hasOwnProperty(current) ? result[current] + 1 : 1;
+    return result;
+  }, {});
+
+  return Object.entries(numAndCountBoard)
+    .sort((a, b) => b[1] - a[1])
+    .slice(0, k)
+    .map((element) => element[0]);
+};