Good morning! Here's our prompt for today.

A matrix is Toeplitz if every diagonal from top-left to bottom-right has the same elements.

Given an m x n matrix, return true if the matrix is Toeplitz. Otherwise, return false.

For example, consider the matrices above. The first matrix has all its diagonals filled with the same elements, whereas the second matrix has only two diagonals with the same elements. Having even a single diagonal with different elements would not make the matrix, a Toeplitz matrix.

Constraints

• m == matrix.length
• n == matrix[i].length
• 1 <= m, n <= 20
• 0 <= matrix[i][j] <= 99

Try to solve this here or in Interactive Mode.

How do I practice this challenge?

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var assert = require('assert');

​

function is_toeplitz_matrix(matrix) {

    //fill in

    return matrix

}

​

try {

    assert.equal(is_toeplitz_matrix([

        [1, 2, 3, 4],

        [5, 1, 2, 3],

        [9, 5, 1, 2]

    ]), true);

​

    console.log('PASSED: ' + "is_toeplitz_matrix([[1,2,3,4],[5,1,2,3],[9,5,1,2]]) should return `true`");

} catch (err) {

    console.log(err);

}

​

try {

    assert.equal(is_toeplitz_matrix([

        [1, 2, 3],

        [4, 1, 2],

        [5, 4, 1]

    ]), true);

​

    console.log('PASSED: ' + "is_toeplitz_matrix([[1,2,3],[4,1,2],[5,4,1]]) should return `true`");

} catch (err) {

    console.log(err);

We'll now take you through what you need to know.

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