What Sorting Algorithm Does JavaScript\'s `Array#sort()` Use?

Delving into the Algorithms Behind JavaScript Array#sort()

The JavaScript Array#sort() function stands as a versatile tool for organizing elements within an array. While it remains adaptive to various arguments and functions, the question arises: what algorithm serves as the backbone of its vanilla implementation?

Under the Hood of Numeric Arrays

According to the source code of WebKit (the core engine powering Chrome and Safari), numeric arrays or those containing primitive types undergo sorting through a C standard library function known as std::qsort. This function typically employs quick or introsort techniques to achieve efficient sorting.

Sorting Strategies for Non-Numeric Arrays

In the case of contiguous non-numeric arrays, a merge or quick sort is utilized to establish the desired order. The choice between these two techniques depends on availability: merge sort is prioritized for stability, while quick sort is employed in its absence.

Handling Diverse Array Types

For non-contiguous arrays and associative arrays, WebKit resorts to selection sort or an AVL tree. Regrettably, further details on the specific assignments remain somewhat unclear from the documentation.

A Call for Refinement

WebKit's codebase unveils an intriguing note expressing the need for refinement in sort algorithms. It suggests the exploration of radix sort as a potential future enhancement, acknowledging its potential for superior performance. However, it remains to be seen whether this improvement will be implemented in the near future.

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