Merging two sorted arrays into one sorted array using JavaScript

Problem

We are required to write a JavaScript function that takes in two sorted arrays of numbers our function should merge all the elements of both the arrays into a new array and return that new array sorted in the same order.

Example

Following is the code −

 Live Demo

const arr1 = [1, 3, 4, 5, 6, 8]; const arr2 = [4, 6, 8, 9, 11]; const mergeSortedArrays = (arr1 = [], arr2 = []) => {    const res = [];    let i = 0;    let j = 0;    while(i < arr1.length && j < arr2.length){       if(arr1[i] < arr2[j]){          res.push(arr1[i]);          i++;       }else{          res.push(arr2[j]);          j++;       }    };    while(i < arr1.length){       res.push(arr1[i]);       i++;    };    while(j < arr2.length){       res.push(arr2[j]);       j++;    };    return res; }; console.log(mergeSortedArrays(arr1, arr2));

Output

[ 1, 3, 4, 4, 5, 6, 6, 8, 8, 9, 11 ]