Solution for HackerRank > Algorithms > Warmup > Diagonal difference

diagonal-difference.js

function diagonalDifference(arr) {
    let left_diagonal = 0
    let right_diagonal = 0
    let total = 0

    for (let i = 0; i < arr.length; i++){
        left_diagonal += arr[i][i]

        right_diagonal += arr[arr.length - 1 - i][i]

        total = Math.abs(left_diagonal - right_diagonal)
    }
    return total

}