add solution: top-k-frequent-elements

Author: yihyun-kim1

top-k-frequent-elements/yihyun-kim1.js

@@ -0,0 +1,17 @@
+/**
+ * @param {number[]} nums
+ * @param {number} k
+ * @return {number[]}
+ */
+const topKFrequent = (nums, k) => {
+  const map = new Map();
+
+  for (let num of nums) {
+    map.set(num, (map.get(num) || 0) + 1);
+  }
+
+  return [...map.entries()]
+    .sort((a, b) => b[1] - a[1])
+    .slice(0, k)
+    .map((entry) => entry[0]);
+};