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shellSort.js
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shellSort.js
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'use strict';
var incs = new Uint32Array([1391376, 463792, 198768, 86961, 33936, 13776, 4592, 1968, 861, 336, 112, 48, 21, 7, 3, 1]);
function defaultCompareFunction(a, b) {
return a - b;
}
function shellSort(srcArray, compareFunction, reverse) {
var array = srcArray.slice(0);
var l = array.length;
var tmp, compare;
var _compare = compareFunction || defaultCompareFunction;
if (reverse) {
compare = function(a, b) {
return _compare(b, a);
};
} else {
compare = _compare;
}
for (var k = 0; k < 16; k++) {
for (var h = incs[k], i = h; i < l; i++) {
var v = array[i];
var j = i;
while (j >= h && compare(array[j - h], v) > 0) {
array[j] = array[j - h];
j -= h;
}
array[j] = v;
}
}
return array;
}
module.exports = shellSort;