Nodejs Array Merge Sort mergeSort(array)

Method Source Code

// Mergesort//  w  ww  . j a  v a  2  s. c o m
function merge(left, right) {
  const merged = [];

  while (left.length > 0 && right.length > 0) {
    let nextItem = (left[0] < right[0]) ? left.shift() : right.shift();
    merged.push(nextItem);
  }

  return merged.concat(left, right);
}

function mergeSort(array) {
  if (array.length < 2) {
    return array;
  } else {
    const middle = Math.floor(array.length / 2);

    const left = mergeSort(array.slice(0, middle));
    const right = mergeSort(array.slice(middle));

    return merge(left, right);
  }
}

Related

1. mergeSort(arr)

   var mergeSort = function (arr) {
       var n = parseInt(arr.length/2);
       if(n < 1){
           return arr;
       }else{
           var arr1 = mergeSort(arr.slice(0, n));
           var arr2 = mergeSort(arr.slice(n));
       var a = [];
   ...
   

2. mergesort (arr, lo, hi)

   'use strict';
   Array.prototype.swap = function (i, j) {
     const temp = this[i];
     this[i] = this[j];
     this[j] = temp;
   function mergesort (arr, lo, hi) {
     function partition (lo, hi) {
       if (lo >= hi) return;
   ...
   

3. mergesort(A)

   function merge(left, right) {
     var result = [];
     while(left.length > 0 || right.length > 0) {
       if(left.length > 0 && right.length > 0) {
         if(left[0] <= right[0]) {
           result.push(left.shift());
         } else {
           result.push(right.shift());
       } else if(left.length > 0) {
         result.push(left.shift());
       } else if(right.length > 0) {
         result.push(right.shift());
     return result;
   function mergesort(A) {
     if(A.length < 2) {
       return A;
     var middle = Math.ceil(A.length / 2);
     var left = A.splice(0, middle);
     var right = A;
     left = mergesort(left);
     right = mergesort(right);
     return merge(left, right);
   Array.prototype.mergeSort = function() {
     return mergesort(this);
   

4. mergesort(lst)

   var arr = [2, 4, 6, 1, 3, 5, 8, 7];
   var mergesort = function (lst) {
       if (lst.length === 1) return lst;
       var L = lst.slice(0, lst.length / 2),
           R = lst.slice(lst.length / 2, lst.length);
       var left = mergesort(L),
           right = mergesort(R);
       return merge(left, right);
       function merge(left, right) {
   ...
   

5. mergeSort(array)

   function mergeSort(array) {
     var merge = function (left, right) {
       var total = []
       while (left.length && right.length)
         total.push(left[0] <= right[0] ? left.shift() : right.shift())
       return total.concat(left.concat(right));
     var length = array.length;
     if (length < 2) return array
   ...
   

6. mergeSort()

   Array.prototype.mergeSort = function(){
       var merge = function(left,right){
           var merged = [];
           while(left.length && right.length){
               merged.push(left[0] <= right[0] ? left.shift():right.shift());
           return merged.concat(left.concat(right));
       if (this.length < 2) return this;
   ...
   

7. mergeSort()

   Array.prototype.mergeSort = function(){
       var merge = function(left,right){
           var merged = [];
           while(left.length && right.length){
               merged.push(left[0] <= right[0] ? left.shift():right.shift());
           return merged.concat(left.concat(right));
       var myarray = [];
   ...
   

8. mergeSort()

   Array.prototype.mergeSort = function() {
     function merge(left, right) {
       var arr = []
       while(left.length && right.length) {
         if(left[0] < right[0]) {
           arr.push(left.shift())
         } else {
           arr.push(right.shift())
       return arr.concat(left, right)
     var len = this.length
     if(len > 1) {
       var index = Math.floor(len/2)
       var left = this.slice(0, index)
       var right = this.slice(index)
       return merge(left.mergeSort(), right.mergeSort())
     } else {
       return this
   

9. mergeSort()

   Array.prototype.mergeSort = function () {
     if (this.length <= 1) {
       return this;
     var half = parseInt(this.length / 2);
     var left = this.slice(0, half).mergeSort();
     var right = this.slice(half, this.length).mergeSort();
     var merge = function (left, right) {
     var ary = [];
   ...