# Alternatively merging two arrays - JavaScript

JavascriptWeb DevelopmentFront End TechnologyObject Oriented Programming

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];

## Example

Following is the code −

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

This will produce the following output in console −

[
4, 2, 3, 1, 2, 6,
5, 8, 6, 9, 8, 4,
9, 3
]
Published on 30-Sep-2020 13:40:43