I have written a program to merge two unsorted arrays in one sorted array.

Here is the code

(function(){     'use strict';      mainFunction();      function mainFunction(){         var array = getCommandLineVariables();         var firstArray = array[0],             secondArray = array[1];          // sort individual arrays            bubbleSort(firstArray);         bubbleSort(secondArray);          console.log(firstArray," -+- ",secondArray);          // merge two sorted arrays         var merged_Array = merge(firstArray,secondArray);          console.log(merged_Array);     } // end of mainFunction      // merge two sorted arrays     function merge(firstArray,secondArray){         var i = 0, j = 0, mergedArray = [];          while(i < firstArray.length && j < secondArray.length){             if(firstArray[i] < secondArray[j]){                 mergedArray.push(firstArray[i]);                 i++;             }else{                 mergedArray.push(secondArray[j]);                 j++;             }         } // end of while          // if length of first array is greater than second array         while(i < firstArray.length){             mergedArray.push(firstArray[i]);             i++;         } // end of while          // if length of second array is greater than first array         while(j < secondArray.length){             mergedArray.push(secondArray[j]);             j++;         } // end of while          return mergedArray;     } // end of merge function      // sort an array using bubble sort     function bubbleSort(numArray){         var i = 0, j = 0;         for(;i < numArray.length; i++){             for(j = i + 1; j < numArray.length; j++){                 if(numArray[i] > numArray[j]){                     swap(i,j,numArray);                      }             }         }     } // end of bubbleSort      // swap number positions in an array     function swap(currentIndex,nextIndex,arr){         var temp = arr[currentIndex];         arr[currentIndex] = arr[nextIndex];         arr[nextIndex] = temp;     } // end of swap      /*         Capture the numbers passed as commandline arguments     */     function getCommandLineVariables(){         var arg_array = process.argv.slice(2),             someArray = [], arr = [];          if(arg_array.length !== 2){             throw new Error("Pass two comma seperated number string in accending order for example 1,2,3 4,5,6");         }          for(var i = 0; i < arg_array.length; i++){              arr = (function(someString){                 var numArray = someString.split(",");                  numArray = numArray.map(function(str){                     return parseInt(str);                 });                       return numArray;                             })(arg_array[i])              someArray.push(arr);              } // end of for           return someArray;     } // end of getCommandLineVariables })();  

The above code does following steps

1. accept two comma separated string of numbers and convert it into two number arrays.
2. Apply sorting on these arrays individually. Hence we get two sorted arrays
3. Merge two sorted array’s in to one

I run the code as follows,

E:\DataStructuresAndAlgorithms\array>node mergeUnsortedArray02.js 33,13,23,43,37 78,11,4,3 [ 13, 23, 33, 37, 43 ] ' -+- ' [ 3, 4, 11, 78 ] [ 3, 4, 11, 13, 23, 33, 37, 43, 78 ]  E:\DataStructuresAndAlgorithms\array> 

Please review my code, Also let me know is my logic proper, Can I further improve the algorithm using other techniques. Thanks.