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A tiny and fast selection algorithm in JavaScript.

Package Exports

  • quickselect

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (quickselect) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

quickselect Build Status

A tiny and fast selection algorithm in JavaScript (specifically, Floyd-Rivest selection).

quickselect(array, k[, left, right, compareFn]);

Rearranges items so that all items in the [left, k] are the smallest. The k-th element will have the (k - left + 1)-th smallest value in [left, right].

  • array: the array to partially sort (in place)
  • k: middle index for partial sorting (as defined above)
  • left: left index of the range to sort (0 by default)
  • right: right index (last index of the array by default)
  • compareFn: compare function

Example:

var arr = [65, 28, 59, 33, 21, 56, 22, 95, 50, 12, 90, 53, 28, 77, 39];

quickselect(arr, 8);

// arr is [39, 28, 28, 33, 21, 12, 22, 50, 53, 56, 59, 65, 90, 77, 95]
//                                         ^^ middle index