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+### quickSort
+
+QuickSort an Array (ascending sort by default).
+
+Use recursion. 
+Use `Array.filter` and spread operator (`...`) to create an array that all elements with values less than the pivot come before the pivot, and all elements with values greater than the pivot come after it. 
+If the parameter `desc` is truthy, return array sorts in descending order.
+
+```js
+const quickSort = ([n, ...nums], desc) =>
+  isNaN(n)
+    ? []
+    : [
+      	...quickSort(nums.filter(v => desc ? v > n : v <= n), desc),
+        n,
+        ...quickSort(nums.filter(v =>!desc ? v > n : v <= n), desc)
+      ]
+```
+
+```js
+quickSort([4,1,3,2,]); // [1,2,3,4]
+quickSort([4,1,3,2,],true); // [4,3,2,1]
+```