Diagonal Difference

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    For Javascript solution:

    function diagonalDifference(arr) {
        let tampung = 0;
        let tampung2 = 0;
        let n = arr.length;
        for(let i=0; i < n; i++){
            tampung = tampung + arr[i][i];
            tampung2 = tampung2 + arr[i][n - 1 - i];
        }
        return Math.abs(tampung - tampung2);
    }