Nodejs Array Quick Sort qsort(array, begin, end)

Method Source Code

// Quicksort/*from   w  ww.  ja v a2s.  co  m*/

var arr = [2, 4, 6, 1, 3, 5, 8, 7];

Array.prototype.swap=function(a, b)
{
   var tmp=this[a];
   this[a]=this[b];
   this[b]=tmp;
}

function qsort(array, begin, end)
{
   if(end-1>begin) {
      var pivot=begin+Math.floor(Math.random()*(end-begin));
      pivot=partition(array, begin, end, pivot);

      qsort(array, begin, pivot);
      qsort(array, pivot+1, end);
   }
    return  array;
}


function partition(array, begin, end, pivot)
{
   var piv=array[pivot];
   array.swap(pivot, end-1);
   var store=begin;
   var ix;
   for(ix=begin; ix<end-1; ++ix) {
      if(array[ix]<=piv) {
         array.swap(store, ix);
         ++store;
      }
   }
   array.swap(end-1, store);

   return store;
}


console.log(qsort(arr, 0, arr.length));

Related

1. quick_sort()

   Array.prototype.quick_sort = function () {
       if (this.length < 2) { return this; }
       var pivot = this[Math.floor(Math.random() * this.length)];
       return this.filter(x => x <  pivot)
                  .quick_sort()
                  .concat(this.filter(x => x == pivot))
                  .concat(this.filter(x => x >  pivot).quick_sort());
   };
   

2. qsort(array, begin, end)

   function partition(array, begin, end, pivot)
     var piv=array[pivot];
     array.swap(pivot, end-1);
     var store=begin;
     var ix;
     for(ix=begin; ix<end-1; ++ix) {
       if(array[ix]<=piv) {
         array.swap(store, ix);
   ...
   

3. qsort(array, begin, end)

   Array.prototype.swap=function(a, b)
     var tmp=this[a];
     this[a]=this[b];
     this[b]=tmp;
   function partition(array, begin, end, pivot)
     var piv=array[pivot];
   ...
   

4. qsort(array, begin, end)

   $(function ($) {
   function dosort(form)
     var array=form.unsorted.value.split(/ +/);
     quick_sort(array);
     form.sorted.value=array.join(' ');
   function quick_sort(array)
     qsort(array, 0, array.length);
   function qsort(array, begin, end)
     if(end-1>begin) {
       var pivot=begin+Math.floor(Math.random()*(end-begin));
       pivot=partition(array, begin, end, pivot);
       qsort(array, begin, pivot);
       qsort(array, pivot+1, end);
   function partition(array, begin, end, pivot)
     var piv=array[pivot];
     array.swap(pivot, end-1);
     var store=begin;
     var ix;
     for(ix=begin; ix<end-1; ++ix) {
       if(array[ix]<=piv) {
         array.swap(store, ix);
         ++store;
     array.swap(end-1, store);
     return store;
   Array.prototype.swap=function(a, b)
     var tmp=this[a];
     this[a]=this[b];
     this[b]=tmp;
   });
   

5. qsort(array, begin, end)

   Array.prototype.swap=function swapf(a, b)
       var tmp=this[a];
       this[a]=this[b];
       this[b]=tmp;
   function partition(array, begin, end, pivot)
       var piv=array[pivot];
   ...
   

6. qsort()

   Array.prototype.qsort = function()
       if (this.length < 2)
           return this;
       var head = this.shift();
       return unpack(function(low, high) {
           return [].concat(low.qsort(), head, high.qsort());
       }, this.partition(function(_) { return _ < head; }));
   };
   ...
   

7. qsort(begin,end)

   Array.prototype.qsort = function(begin,end){
     function swap(array,a,b){
       var c = array[a];
       array[a] = array[b];
       array[b] = c;
     if(begin < end){
       var array = this;
       var index = begin;
   ...