Exercise : Sum of Diagonals

sum_of_diagonals.md

Sum of Diagonals of a Square Matrix

Write a function that accepts a two dimensional matrix and returns the sum of the two diagonals.

• The matrix should be a square matrix (ie. equal number of rows and columns)
• You can use only one loop.

Example 1:

[[1,2,3],
 [4,5,6],
 [7,8,9]]

Sum of the two diagonals is 1 + 5 + 9 + 3 + 5 + 7 = 30

Example 2:

[[1,-2, 1,-4],
 [5, 6, 7, 8],
 [1,-3, 2, 0],
 [3, 4, 5,-1]]
 
 
 

Sum of the two diagonals is 1 + 6 + 2 -1 -4 + 7 -3 + 3 = 11

Example 3:

[[-1,-2],
 [ 3, 4]]

Sum of the two diagonals is -1 + 4 -2 + 3 = 4

Example 4:

[[5]]

Sum = 10

STARTING ANSWER

---

function sumOfDiagonals(matrix){
// write your code here
}
console.log(sumOfDiagonals([[1,2,3],
                            [4,5,6],
                            [7,8,9]]));//30
console.log(sumOfDiagonals([[-1,-2],
                            [ 3, 4]]));//4
console.log(sumOfDiagonals([[1]]));//2,
                            

---