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Merge pull request #545 from marsonya/doctests/cocktail-shaker-sort
Improved CocktailShakerSort and added Doctests
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@ -1,40 +1,55 @@
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/*
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* Cocktail shaker sort is a sort algorithm that is a bidirectional bubble sort
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* more information: https://en.wikipedia.org/wiki/Cocktail_shaker_sort
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* more information: https://en.wikipedia.org/wiki/Bubble_sort
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* Cocktail Shaker Sort is an algorithm that is a Bidirectional Bubble Sort.
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* The algorithm extends bubble sort by operating in two directions.
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* While it improves on bubble sort by more quickly moving items to the beginning of the list,
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* it provides only marginal performance improvements.
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*
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* Wikipedia (Cocktail Shaker Sort): https://en.wikipedia.org/wiki/Cocktail_shaker_sort
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* Wikipedia (Bubble Sort): https://en.wikipedia.org/wiki/Bubble_sort
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*
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*/
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/**
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* Doctests
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*
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* > cocktailShakerSort([5, 4, 1, 2, 3])
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* [1, 2, 3, 4, 5]
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* > cocktailShakerSort([])
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* []
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* > cocktailShakerSort([1, 2, 3])
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* [1, 2, 3]
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*/
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function cocktailShakerSort (items) {
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for (let i = items.length - 1; i > 0; i--) {
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let swapped = false
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let j
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// backwards
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// Backwards
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for (j = items.length - 1; j > i; j--) {
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if (items[j] < items[j - 1]) {
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[items[j], items[j - 1]] = [items[j - 1], items[j]]
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swapped = true
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}
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}
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// forwards
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// Forwards
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for (j = 0; j < i; j++) {
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if (items[j] > items[j + 1]) {
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[items[j], items[j + 1]] = [items[j + 1], items[j]]
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swapped = true
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}
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}
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if (!swapped) {
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return
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}
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}
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return items
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}
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// Implementation of cocktailShakerSort
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var ar = [5, 6, 7, 8, 1, 2, 12, 14]
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// Array before Sort
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console.log(ar)
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cocktailShakerSort(ar)
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// Array after sort
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console.log(ar)
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/**
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* Implementation of Cocktail Shaker Sort
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*/
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const array = [5, 6, 7, 8, 1, 2, 12, 14]
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// Before Sort
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console.log('\n- Before Sort | Implementation of Cocktail Shaker Sort -')
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console.log(array)
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// After Sort
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console.log('- After Sort | Implementation of Cocktail Shaker Sort -')
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console.log(cocktailShakerSort(array))
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console.log('\n')
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