Exercise: Diagonal Difference

diagonalDifference.js

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