# Repeating only even numbers inside an array in JavaScript

We are required to write a JavaScript function that should repeat the even number inside the same array.

For example, given the following array −

const arr = [1, 2, 5, 6, 8];

## Output

We should get the output −

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

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

## Example

The code for this will be −

const arr = [1, 2, 5, 6, 8];
const repeatEvenNumbers = arr => {
let end = arr.length -1;
for(let i = end; i > 0; i--){
if(arr[i] % 2 === 0){
arr.splice(i, 0, arr[i]);
};
};
return arr;
};
console.log(repeatEvenNumbers(arr));

## Output

The output in the console will be −

[
1, 2, 2, 5,
6, 6, 8, 8
]