Merging two arrays in a unique way in JavaScript

We are required to write a JavaScript function that takes in two arrays and merges the arrays taking elements alternatively from the arrays.

For example

If the two arrays are −

const arr1 = [4, 3, 2, 5, 6, 8, 9];
const arr2 = [2, 1, 6, 8, 9, 4, 3];

Then the output should be −

const output = [4, 2, 3, 1, 2, 6, 5, 8, 6, 9, 8, 4, 9, 3];

Therefore, let’s write the code for this function −

Example

The code for this will be −

const arr1 = [4, 3, 2, 5, 6, 8, 9];
const arr2 = [2, 1, 6, 8, 9, 4, 3];
const mergeAlernatively = (arr1, arr2) => {
   const res = [];
   for(let i = 0; i < arr1.length + arr2.length; i++){
      if(i % 2 === 0){
         res.push(arr1[i/2]);
      }else{
         res.push(arr2[(i-1)/2]);
      };
   };
   return res;
};
console.log(mergeAlernatively(arr1, arr2));

Output

The output in the console will be −

[
   4, 2, 3, 1, 2, 6,
   5, 8, 6, 9, 8, 4,
   9, 3
]