merge: Add the Stooge Sort Algorithm (#998)

Madiena · web-flow · commit 2e18fbb39aeb · 2022-04-28T13:47:23.000+05:30
* Add stooge sort sorting algorithm with included tests

* Add stooge sort sorting algorithm with included tests

* Add correct url for more information

* Add time complexity warning
diff --git a/Sorts/StoogeSort.js b/Sorts/StoogeSort.js
@@ -0,0 +1,21 @@
+/*
+ * Stooge Sort sorts an array based on divide and conquer principle
+ * note the exceptionally bad time complexity
+ * more information: https://en.wikipedia.org/wiki/Stooge_sort
+ *
+ */
+export function stoogeSort (items, leftEnd, rightEnd) {
+  if (items[rightEnd - 1] < items[leftEnd]) {
+    const temp = items[leftEnd]
+    items[leftEnd] = items[rightEnd - 1]
+    items[rightEnd - 1] = temp
+  }
+  const length = rightEnd - leftEnd
+  if (length > 2) {
+    const third = Math.floor(length / 3)
+    stoogeSort(items, leftEnd, rightEnd - third)
+    stoogeSort(items, leftEnd + third, rightEnd)
+    stoogeSort(items, leftEnd, rightEnd - third)
+  }
+  return items
+}
diff --git a/Sorts/test/StoogeSort.test.js b/Sorts/test/StoogeSort.test.js
@@ -0,0 +1,31 @@
+import { stoogeSort } from '../StoogeSort'
+
+test('The StoogeSort of the array [1, 6, 4, 7, 2] is [1, 2, 4, 6, 7]', () => {
+  const arr = [1, 6, 4, 7, 2]
+  const res = stoogeSort(arr, 0, arr.length)
+  expect(res).toEqual([1, 2, 4, 6, 7])
+})
+
+test('The StoogeSort of the array [] is []', () => {
+  const arr = []
+  const res = stoogeSort(arr, 0, arr.length)
+  expect(res).toEqual([])
+})
+
+test('The StoogeSort of the array [46, 15, 49, 65, 23] is [15, 23, 46, 49, 65]', () => {
+  const arr = [46, 15, 49, 65, 23]
+  const res = stoogeSort(arr, 0, arr.length)
+  expect(res).toEqual([15, 23, 46, 49, 65])
+})
+
+test('The StoogeSort of the array [136, 459, 132, 566, 465] is [132, 136, 459, 465, 566]', () => {
+  const arr = [136, 459, 132, 566, 465]
+  const res = stoogeSort(arr, 0, arr.length)
+  expect(res).toEqual([132, 136, 459, 465, 566])
+})
+
+test('The StoogeSort of the array [45, 3, 156, 1, 56] is [1, 3, 45, 56, 156]', () => {
+  const arr = [45, 3, 156, 1, 56]
+  const res = stoogeSort(arr, 0, arr.length)
+  expect(res).toEqual([1, 3, 45, 56, 156])
+})
