<ul><li>The challenge is to create a function that takes a square matrix (2D array) and returns the sum of the numbers in the matrix's main diagonal.</li><li>The main diagonal of a matrix consists of the elements from the top left corner to the bottom right corner.</li><li>The difficulty level of the challenge is easy and the topic is matrix manipulation.</li><li>Developers are encouraged to solve the challenge by forking the given challenge, writing the solution, and testing it against the provided test cases.</li></ul>

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

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