9.1.7 Checkerboard V2 Codehs //free\\ 〈2026 Edition〉

// Set the size of the checkerboard var squareSize = 50; var rows = 8; var cols = 8;

Dynamically calculating the top-left corner (x, y) of each individual square based on its current row and column index. The Logic Behind the Alternating Pattern

After the loops have finished building your board, you must print it row by row. Using print " ".join(row)

Whether you are printing text to the console or drawing colored rectangles on a canvas, the logic remains identical. Write your code to be flexible (no magic numbers), test edge cases (1 row or 1 column), and always double-check your starting color. 9.1.7 Checkerboard V2 Codehs

: Create an 8x8 grid (a list of 8 lists, each containing 8 zeros). ): board.append([ Use code with caution. Copied to clipboard Nested Loop Iteration loops to visit every coordinate. Conditional Check : Use the modulus operator to determine which cells to flip. : board[r][c] = Use code with caution. Copied to clipboard Displaying the Result

The "V2" autograder on CodeHS is stricter. It may check for:

: Ensure your loops use strict inequalities (e.g., i < GRID_SIZE ) so you do not accidentally draw an extra row outside the canvas boundaries. // Set the size of the checkerboard var

: Squares change color based on their specific position.

This article breaks down the logic, structure, and code required to solve this exercise efficiently. Understanding the Goal

Using a loop inside another loop to handle the rows ( -axis) and columns ( -axis) of the grid. Write your code to be flexible (no magic

First, ensure you know the dimensions of the grid. CodeHS usually provides constants or variables for the number of rows and columns (e.g., grid.length for rows and grid[0].length for columns). Step 2: Set Up Nested Loops

This approach is fine for an 8x8 board, but what if you needed a 12x12 board? That's a lot of repetitive code. A better, more professional approach is to write a function that can build a checkerboard of any size.