3
06/11/2024 5:22 pm
Topic starter
A square matrix of numbers comes as an array of strings, each string holding numbers (space separated). Write a JS function that finds the sum at the main and at the secondary diagonals.
The input comes as array of arrays, containing number elements (2D matrix of numbers).
Examples:
Input:
[[20, 40],
[10, 60]]
Output:
80 50
Input:
[[3, 5, 17],
[-1, 7, 14],
[1, -8, 89]]
Output:
99 25
The output is printed on the console, on a single line separated by space. First print the sum at the main diagonal, then the sum at the secondary diagonal.
1 Answer
2
06/11/2024 5:23 pm
Here's my JS matrix solution:
function diagonalSums(matrix) {
let mainSum = 0, secondarySum = 0;
for (let row = 0; row < matrix.length; row++) {
mainSum += matrix[row][row];
secondarySum += matrix[row][matrix.length - row - 1];
}
console.log(mainSum + ' ' + secondarySum);
}
diagonalSums([[20, 40], [10, 60]]);
