Daily JavaScript Challenge #JS-141: Add Numbers in a Matrix Diagonal

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Daily JavaScript Challenge: Add Numbers in a Matrix Diagonal

Hey fellow developers! 👋 Welcome to today's JavaScript coding challenge. Let's keep those programming skills sharp!

The Challenge

Difficulty: Easy

Topic: Matrix Manipulation

Description

Create a function that takes a square matrix (2D array) as input and returns the sum of the numbers in the matrix's main diagonal. The main diagonal of a matrix consists of the elements starting from the top left corner to the bottom right corner.

Ready to Begin?

https://www.dpcdev.com/

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Write your solution
Test it against the provided test cases
Share your approach in the comments below!

Want to Learn More?

Check out the documentation about this topic here: https://en.wikipedia.org/wiki/Matrix_(mathematics)

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This is part of our Daily JavaScript Challenge series. Follow me for daily programming challenges and let's grow together! 🚀

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Top comments (1)

Asfia Aiman • Apr 4

function twoDimensionalArray(arrayOne) {
let sum = 0;

for (let i = 0; i < arrayOne.length; i++) {
    if (!Array.isArray(arrayOne[i]) || arrayOne[i][i] === undefined) {
        throw new Error("Invalid input: Must be a square 2D array.");
    }
    sum += arrayOne[i][i];
}

return sum;

}