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Merge pull request #545 from marsonya/doctests/cocktail-shaker-sort

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Improved CocktailShakerSort and added Doctests
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marsonya
2020-12-18 13:49:21 +05:30
committed by GitHub
parent 74f9bfb8a8 d44ffef467
commit 1abd3aad5f
1 changed files with 34 additions and 19 deletions
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53
Sorts/CocktailShakerSort.js
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@ -1,40 +1,55 @@
/*
* Cocktail shaker sort is a sort algorithm that is a bidirectional bubble sort
* more information: https://en.wikipedia.org/wiki/Cocktail_shaker_sort
* more information: https://en.wikipedia.org/wiki/Bubble_sort
* Cocktail Shaker Sort is an algorithm that is a Bidirectional Bubble Sort.
* The algorithm extends bubble sort by operating in two directions.
* While it improves on bubble sort by more quickly moving items to the beginning of the list,
* it provides only marginal performance improvements.
*
* Wikipedia (Cocktail Shaker Sort): https://en.wikipedia.org/wiki/Cocktail_shaker_sort
* Wikipedia (Bubble Sort): https://en.wikipedia.org/wiki/Bubble_sort
*
*/
/**
* Doctests
*
* > cocktailShakerSort([5, 4, 1, 2, 3])
* [1, 2, 3, 4, 5]
* > cocktailShakerSort([])
* []
* > cocktailShakerSort([1, 2, 3])
* [1, 2, 3]
*/
function cocktailShakerSort (items) {
for (let i = items.length - 1; i > 0; i--) {
let swapped = false
let j
// backwards
// Backwards
for (j = items.length - 1; j > i; j--) {
if (items[j] < items[j - 1]) {
[items[j], items[j - 1]] = [items[j - 1], items[j]]
swapped = true
}
}
// forwards
// Forwards
for (j = 0; j < i; j++) {
if (items[j] > items[j + 1]) {
[items[j], items[j + 1]] = [items[j + 1], items[j]]
swapped = true
}
}
if (!swapped) {
return
}
}
return items
}
// Implementation of cocktailShakerSort
var ar = [5, 6, 7, 8, 1, 2, 12, 14]
// Array before Sort
console.log(ar)
cocktailShakerSort(ar)
// Array after sort
console.log(ar)
/**
* Implementation of Cocktail Shaker Sort
*/
const array = [5, 6, 7, 8, 1, 2, 12, 14]
// Before Sort
console.log('\n- Before Sort | Implementation of Cocktail Shaker Sort -')
console.log(array)
// After Sort
console.log('- After Sort | Implementation of Cocktail Shaker Sort -')
console.log(cocktailShakerSort(array))
console.log('\n')