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/**

* 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

*/

export function cocktailShakerSort (items) {

for (let i = items.length - 1; i > 0; i--) {

let j

// 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]]

}

}

// Forwards

for (j = 0; j < i; j++) {

if (items[j] > items[j + 1]) {

[items[j], items[j + 1]] = [items[j + 1], items[j]]

}

}

}

return items

}