HackerRank Diagonal difference challenge solution JS

diagonal-difference.js

// Given a square matrix, calculate the absolute difference between the sums of its diagonals.

function diagonalDifference(arr) {
    // Write your code here
    
    let right = 0;
    let left = 0;
    let interations = arr.length -1;
    for(let i = 0; i < arr.length; i++){
        right += arr[i][i];
        left += arr[i][interations];
        interations -=1;
    };
    return Math.abs(right - left);

}