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+# Sorting algorithms comparison
+
+This program compares the performance of three different sorting
+algorithms:
+
+-   bubble sort
+-   selection sort
+-   quicksort
+
+It consists of the following functions:
+
+  ----------------------- ---------------------------------------------------------------------------------------------------
+  **`sortAll()`**         Top-level function. Iteratively (200 iterations) generates a randomized array and calls `sort()`.
+  **`sort()`**            Calls each of `bubbleSort()`, `selectionSort()`, `quickSort()` in turn and logs the result.
+  **`bubbleSort()`**      Implements a bubble sort, returning the sorted array.
+  **`selectionSort()`**   Implements a selection sort, returning the sorted array.
+  **`quickSort()`**       Implements quicksort, returning the sorted array.
+  `swap()`                Helper function for `bubbleSort()` and `selectionSort()`.
+  `partition()`           Helper function for `quickSort()`.
+  ----------------------- ---------------------------------------------------------------------------------------------------
+
+Its call graph looks like this:
+
+    sortAll()                     // (generate random array, then call sort) x 200
+
+        -> sort()                 // sort with each algorithm, log the result
+
+            -> bubbleSort()
+
+                -> swap()
+
+            -> selectionSort()
+
+                -> swap()
+
+            -> quickSort()
+
+                -> partition()
+
+The implementations of the sorting algorithms in the program are taken
+from <https://github.com/nzakas/computer-science-in-javascript/> and are
+used under the MIT license.
+
+You can try out the example program
+[here](https://mdn.github.io/performance-scenarios/js-call-tree-1/index.html)
+and clone the code [here](https://github.com/mdn/performance-scenarios)
+(be sure to check out the gh-pages branch). You can also [download the
+specific profile we
+discuss](https://github.com/mdn/performance-scenarios/tree/gh-pages/js-call-tree-1/profile)
+- just import it to the Performance tool if you want to follow along. Of
+course, you can generate your own profile, too, but the numbers will be
+a little different.