# X-Matrix Checker Lab

Easy

In this lab, you will be implementing a function to check if a given square matrix is an X-Matrix. An X-Matrix has the following conditions:

1. All the elements in the diagonals of the matrix are non-zero.
2. All other elements are 0.

You will write a function `checkXMatrix` that takes a 2D integer array `grid` of size `n x n` representing a square matrix, and returns `true` if the given `grid` is an X-Matrix. Otherwise, it should return `false`.

## Function signature

``````/**
* @param {number[][]} grid
* @return {boolean}
*/
var checkXMatrix = function(grid) {

};``````

## Example 1:

``````const grid = [
[2, 0, 0, 1],
[0, 3, 1, 0],
[0, 5, 2, 0],
[4, 0, 0, 2]
];
checkXMatrix(grid); // Returns: true``````

Explanation: In this example, all the elements in the diagonals are non-zero, and all other elements are 0. Thus, the given `grid` is an X-Matrix.

## Example 2:

``````const grid = [
[5, 7, 0],
[0, 3, 1],
[0, 5, 0]
];
checkXMatrix(grid); // Returns: false``````

Explanation: In this example, the element at position (0, 1) is non-zero and not part of the diagonal. Hence, the given `grid` is not an X-Matrix.

## Constraints:

• `n == grid.length == grid[i].length`
• `3 <= n <= 100`
• `0 <= grid[i][j] <= 10^5`

Now that you have an understanding of the problem, go ahead and build the lab according to the main instructions provided in the first message. Make sure to write the evaluation script and set up the test environment properly.