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Implemented shell sort algorithm #20

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Merged
the-codingninja merged 1 commit into from
Oct 5, 2017
+40 −0
Merged

Implemented shell sort algorithm #20

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40 changes: 40 additions & 0 deletions Sorts/shellSort.js
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Original file line number Diff line number Diff line change
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/*
* Shell Sort sorts an array based on insertion sort algorithm
* more information: https://en.wikipedia.org/wiki/Shellsort
*
*/
function shellSort(items) {

var interval = 1;

while (interval < items.length / 3) {

interval = interval * 3 + 1;
}

while (interval > 0) {

for (var outer = interval; outer < items.length; outer++) {

var value = items[outer];
var inner = outer;

while (inner > interval - 1 && items[inner - interval] >= value) {
items[inner] = items[inner - interval];
inner = inner - interval;
}
items[inner] = value;
}
interval = (interval - 1) / 3;
}
return items;
}

//Implementation of shellSort

var ar = [5, 6, 7, 8, 1, 2, 12, 14];
//Array before Sort
console.log(ar);
shellSort(ar);
//Array after sort
console.log(ar);