916 Checkerboard V1 Codehs Fixed <FREE ✓>

Copy and paste this code directly into your CodeHS editor. This solution is designed to handle both odd and even grid dimensions dynamically. javascript

To touch every single cell in a 2D array, you must use nested for loops:

// Constants for the board dimensions const BOARD_SIZE = 8; // 8x8 grid const SQUARE_SIZE = 50; // Pixels per square const BOARD_WIDTH = BOARD_SIZE * SQUARE_SIZE; const BOARD_HEIGHT = BOARD_SIZE * SQUARE_SIZE;

// Add the square to the canvas board.add(square); 916 checkerboard v1 codehs fixed

This is the "aha!" moment for the assignment. It teaches that patterns in computer science are often mathematical. By checking if the sum of the coordinates is even or odd, the code automatically creates the staggered pattern required for a checkerboard, regardless of the grid size.

By breaking the grid down into individual rows and strictly managing how Karel turns around at the walls, you will solve the 9.1.6 Checkerboard with clean, readable, and fully optimized code.

public class Checkerboard extends ConsoleProgram public void run() // 1. Initialize a standard 8x8 2D array int[][] board = new int[8][8]; // 2. Use nested loops to traverse rows and columns for (int i = 0; i < board.length; i++) for (int j = 0; j < board[i].length; j++) // 3. Check if the sum of indices is even or odd if ((i + j) % 2 == 0) board[i][j] = 0; else board[i][j] = 1; // 4. Print the final grid layout printBoard(board); // Helper method to display the 2D array properly private void printBoard(int[][] array) for (int[] row : array) for (int element : row) System.out.print(element + " "); System.out.println(); Use code with caution. Step-by-Step Code Analysis Copy and paste this code directly into your CodeHS editor

The beauty of the fixed code lies in its use of the for loop. By nesting a column loop inside a row loop, the program efficiently visits every coordinate on the grid. This structure teaches students how computers handle two-dimensional space: not as a continuous canvas, but as a matrix of discrete points defined by x and y coordinates.

Whether you're working in JavaScript with graphics, Python for console output, or Karel the Robot, the core principles remain the same: break down the problem, plan your approach, implement systematically, and debug thoroughly. With these skills, you'll be well-prepared for the subsequent versions (v2 and v3) of the Checkerboard problem, which introduce additional complexity and programming concepts.

Before looking at the fixed code, it is vital to understand the mathematical pattern behind a checkerboard. It teaches that patterns in computer science are

For the CodeHS exercise , the goal is to initialize a

Fixed: 916 Checkerboard v1 (CodeHS) I tracked down a bug in the 916 Checkerboard v1 assignment on CodeHS and pushed a fix. The issue affected pattern alignment when the board width was odd — squares were shifting on every other row. Changes made:

function moveToNextRow() if(facingEast()) turnLeft(); move(); turnLeft(); else turnRight(); move(); turnRight();

The condition if row < 3 or row > 4 targets the "top 3" (0, 1, 2) and "bottom 3" (5, 6, 7) rows as required by the exercise.

The secret weapon in the fixed code is the mathematical expression: (row + col) % 2 == 0 .