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+# Leetcode 1365
+
+<!--toc:start-->
+- [Leetcode 1365](#leetcode-1365)
+  - [Creating a Frequancy Map](#creating-a-frequancy-map)
+    - [Hammer Tool](#hammer-tool)
+<!--toc:end-->
+
+```js
+function reduceArray(nums) {
+  const sorted = [...nums].sort((a, b) => a - b)
+  return nums.map((x) => {
+   nums.indexOf(sorted[x]) 
+  })
+}
+```
+
+## Creating a Frequancy Map
+
+```js
+function reduceArray(nums) {
+  const freqMap = new Map()
+  nums.forEach((x) => {
+    if (freqMap.has(x)) {
+      freqMap.set(x, freqMap.get(x) + 1)
+    } else {
+      freqMap.set(x, 1)
+    }
+  })
+  return Array.from(freqMap.entries()).map(([k, v]) => v)
+}
+```
+
+### Hammer Tool
+
+```js
+function hammer(arrOrStr) {
+    const freq = {};
+    for (let item of arrOrStr) {
+        freq[item] = (freq[item] || 0) + 1;
+    }
+    
+    // Then either:
+    // A. Return freq map
+    // B. Sort using freq
+    return arrOrStr.slice().sort((a, b) => {
+        if (freq[b] !== freq[a]) return freq[b] - freq[a]; // desc freq
+        return a < b ? -1 : 1; // tiebreaker
+    });
+}
+```