# JavaScript Sum odd indexed and even indexed elements separately and return their absolute difference

We are required to write a JavaScript function that takes in an array of numbers. The function should sum odd indexed and even indexed elements separately and finally should return their absolute difference.

## Example

const arr = [4, 6, 3, 1, 5, 8, 9, 3, 4];
const oddEvenDifference = (arr = []) => {
let oddSum = 0;
let evenSum = 0;
for(let i = 0;
i < arr.length; i++){
const el = arr[i];
if(i % 2 === 0){
evenSum += el;
}else{
oddSum += el;
};

};
return Math.abs(oddSum - evenSum);
};
console.log(oddEvenDifference(arr));

## Output

And the output in the console will be −

7

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