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When I sort an Array using the native sort method, which algorithm does Ruby use?
Is it data-dependant, i.e., if the data is small it uses X algorithm else it uses Y algorithm?
Is it a stable sort? What is the average time complexity?
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So, in the end, Collections#sort uses Arrays#sort (of object elements) behind the scenes. This implementation uses merge sort or tim sort. Show activity on this post. According to the Javadoc, only primitive arrays are sorted using Quicksort.
Timsort has been Python's standard sorting algorithm since version 2.3. It is also used to sort arrays of non-primitive type in Java SE 7, on the Android platform, in GNU Octave, on V8, Swift, and Rust.
Many sorting algorithms are available, but the one which is best suited for the almost sorted array is the insertion sort.
IntroSort. IntroSort is the algorithm used by swift to sort a collection. Introsort is an hybrid algorithm invented by David Musser in 1993 with the purpose of giving a generic sorting algorithm for the C++ standard library.
Look here: http://www.igvita.com/2009/03/26/ruby-algorithms-sorting-trie-heaps/
It does natively use quicksort however, which is n log n complexity on average.
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