A tiny and fast selection algorithm in JavaScript. 

quickselect

A tiny and fast selection algorithm in JavaScript.

mourner

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		'use strict';

		module.exports = partialSort;
		module.exports = quickselect;
		module.exports.default = quickselect;

		// Floyd-Rivest selection algorithm:
		// Rearrange items so that all items in the [left, k] range are smaller than all items in (k, right];
		// The k-th element will have the (k - left + 1)th smallest value in [left, right]
		function quickselect(arr, k, left, right, compare) {
		quickselectStep(arr, k, left \|\| 0, right \|\| (arr.length - 1), compare \|\| defaultCompare);
		};

		function partialSort(arr, k, left, right, compare) {
		left = left \|\| 0;
		right = right \|\| (arr.length - 1);
		compare = compare \|\| defaultCompare;
		function quickselectStep(arr, k, left, right, compare) {

		@@ -23,3 +21,3 @@ while (right > left) {
		var newRight = Math.min(right, Math.floor(k + (n - m) * s / n + sd));
		partialSort(arr, k, newLeft, newRight, compare);
		quickselectStep(arr, k, newLeft, newRight, compare);
		}
		@@ -26,0 +24,0 @@

		{
		"name": "quickselect",
		"version": "1.0.0",
		"version": "1.0.1",
		"description": "A tiny and fast selection algorithm in JavaScript.",
		@@ -16,5 +16,13 @@ "main": "index.js",
		},
		"keywords": ["selection", "algorithm", "quickselect", "sort", "partial", "floyd", "rivest"],
		"keywords": [
		"selection",
		"algorithm",
		"quickselect",
		"sort",
		"partial",
		"floyd",
		"rivest"
		],
		"author": "Vladimir Agafonkin",
		"license": "ISC"
		}

		@@ -1,2 +0,2 @@
		## quickselect
		## quickselect [![Build Status](https://travis-ci.org/mourner/quickselect.svg?branch=master)](https://travis-ci.org/mourner/quickselect)

		@@ -23,5 +23,7 @@ A tiny and fast [selection algorithm](https://en.wikipedia.org/wiki/Selection_algorithm) in JavaScript
		var arr = [65, 28, 59, 33, 21, 56, 22, 95, 50, 12, 90, 53, 28, 77, 39];

		quickselect(arr, 8);
		// [39, 28, 28, 33, 21, 12, 22, 50, 53, 56, 59, 65, 90, 77, 95]
		// ^^ 8th item

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

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