solve: top K frequent elements

Author: sounmind

top-k-frequent-elements/evan.js

@@ -0,0 +1,22 @@
+/**
+ * @param {number[]} nums
+ * @param {number} k
+ * @return {number[]}
+ */
+var topKFrequent = function (nums, k) {
+  const counter = new Map();
+
+  nums.forEach((num) => {
+    if (counter.has(num)) {
+      counter.set(num, counter.get(num) + 1);
+    } else {
+      counter.set(num, 1);
+    }
+  });
+
+  const sorted = [...counter.entries()].sort(
+    ([, freqA], [, freqB]) => freqB - freqA
+  );
+
+  return sorted.slice(0, k).map(([num]) => num);
+};