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Add the Stooge Sort Algorithm #998

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Merged
merged 5 commits into from
Apr 28, 2022
Merged

Add the Stooge Sort Algorithm #998

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2a09635
Add stooge sort sorting algorithm with included tests
Madiena Apr 27, 2022
0b2153e
Merge branch 'master' of https://github.com/Madiena/Javascript
Madiena Apr 27, 2022
a456b30
Add stooge sort sorting algorithm with included tests
Madiena Apr 27, 2022
43ec87f
Add correct url for more information
Madiena Apr 27, 2022
e7a05ac
Add time complexity warning
Madiena Apr 27, 2022
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21 changes: 21 additions & 0 deletions Sorts/StoogeSort.js
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Original file line number Diff line number Diff line change
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/*
* 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
}
31 changes: 31 additions & 0 deletions Sorts/test/StoogeSort.test.js
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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])
})