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function diagonalDifference(arr) {
let primDiag = 0
let secDiag = 0
let n = arr.length
for (var i = 0, j = n - 1; i < n; i++, j--) {
primDiag += arr[i][i]
secDiag += arr[i][j]
}
return Math.abs(primDiag - secDiag)
}
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Diagonal Difference
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I altered a little.
}