Question

How to find the sum of boundary elements of a matrix in TypeScript

Answer 1

function getBoundarySum(matrix: number[][]) {
    const rows: number = matrix.length;
    const cols: number = matrix[0].length;
    let sum = 0;
     
    for (let i: number = 0; i < rows; i++) {
        for (let j: number = 0; j < cols; j++) {
            if (i == 0 || j == 0 || i == rows - 1 || j == cols - 1) {
                sum += matrix[i][j];
            }
        }
    }
     
    return sum;
}
         
const matrix: number[][] = [[1,  2,  3,  4], 
                            [5,  6,  7,  8], 
                            [9, 50, 11, 12]];
 
console.log(getBoundarySum(matrix));
 
 

 
 
/*
run:
    
105
    
*/

 

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