Diagonal Difference | Solution | JavaScript

diagonal-difference.js

/* 
  Diagonal Difference Solution.
  sample matrix = [[1,2,3], [4,5,6], [7,8,9]]
*/ 
function diagonalDifference(matrix) {
   // length of input matrix.
    const length = matrix.length;
    let diagonal1 = 0, diagonal2 = 0;
  
    // Looping through the array and summing the diagonals.
    for(let i = 0; i < length; i++){
      // Calculating the primary diagonal.
        diagonal1 += matrix[i][i];
      // Reversing the second dimension of array to calculate secondary diagonal.
        diagonal2 += matrix[length -1 - i][i]
    }
    // return absolute difference value.
    return Math.abs(diagonal1 - diagonal2);  

}

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