Quicksort in XQuery

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Quicksort in XQuery

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Last edited Nov 25, 2015

Created on Nov 22, 2015

This visualization compares four XQuery implementations of the quicksort algorithm, each derived from a Haskell reference, to demonstrate functional programming in a query language. It shows how the same recursive sorting logic can be expressed with different XQuery 3.1 features, including `fn:head()`, `fn:tail()`, `position()`, and a random-number generator for permutation. The code uses `local:qsort` functions with `xs:integer*` sequences, and the final example applies the sort to a shuffled list of 1 to 100 generated via `fn:random-number-generator('permute')`. The display highlights syntactical variations, such as explicit `where` clauses versus nested `if` expressions, without altering the core algorithm.

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