Codehs 8.1.5 Manipulating: 2d Arrays

I don't have direct access to CodeHS's specific problem statements or answer keys, but I can certainly help you understand how to manipulate 2D arrays in Java (since CodeHS Unit 8.1 is typically Java's 2D arrays).

[0,0] [0,1] [0,2]  <-- Row 0
[1,0] [1,1] [1,2]  <-- Row 1
[2,0] [2,1] [2,2]  <-- Row 2

let grid = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9]
];