Created
October 15, 2010 15:50
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| /* Written using http://en.wikipedia.org/wiki/Heapsort pseudocode */ | |
| function Sorter() { | |
| var array; | |
| this.heapsort = function(a) { | |
| array = a; | |
| heapify(); | |
| var end = array.length - 1; | |
| while (end > 0) { | |
| swapElementsWithIndexes(end, 0); | |
| siftDown(0, end - 1); | |
| --end; | |
| } | |
| } | |
| var heapify = function() { | |
| for (var v = Math.floor(array.length / 2); v >= 0; v--) { | |
| siftDown(v, array.length - 1); | |
| } | |
| } | |
| var siftDown = function(start, end) { | |
| var root = start; | |
| while (root * 2 <= end) { | |
| var child = root * 2; | |
| if (child < end && array[child] < array[child+1]) { | |
| ++child; | |
| } | |
| if (array[root] >= array[child]) { | |
| return; | |
| } | |
| swapElementsWithIndexes(root, child); | |
| root = child; | |
| } | |
| } | |
| var swapElementsWithIndexes = function(i, j) { | |
| temp = array[i]; | |
| array[i] = array[j]; | |
| array[j] = temp; | |
| } | |
| } |
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| <!DOCTYPE HTML> | |
| <html> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Heapsort</title> | |
| <script type="text/javascript" src="heapsort.js"></script> | |
| <script type="text/javascript"> | |
| function sortArray() { | |
| var array = []; | |
| for (var i = 0; i < 100; i++) { | |
| array[i] = Math.floor(Math.random() * 1000); | |
| } | |
| var sorter = new Sorter(); | |
| sorter.heapsort(array); | |
| var result = "<p>"; | |
| for (var i in array) { | |
| result += array[i] + "<br>"; | |
| } | |
| result += "</p>"; | |
| document.write(result); | |
| } | |
| </script> | |
| </head> | |
| <body onload="sortArray()"> | |
| </body> | |
| </html> |
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