Remember that the first index is always the row ( board[row][col] ). Reversing these can cause an ArrayIndexOutOfBoundsException on non-square grids.
This mathematical approach guarantees that the grid always alternates perfectly, regardless of how many rows or columns your canvas contains. Fixed Implementation Code
Debugging a grid-based graphics program is a rite of passage for many computer science students. In the CodeHS JavaScript track, Exercise 9.1.6 "Checkerboard v1" frequently challenges students because of specific off-by-one errors and loop logic bugs.
var board = []; for (var i = 0; i < 8; i++) board[i] = []; for (var j = 0; j < 8; j++) if ((i + j) % 2 === 0) board[i][j] = "black"; else board[i][j] = "white";
statements correctly skip the middle two rows, leaving them as zeros. 916 checkerboard v1 codehs fixed
add(square);
"Get the fixed code for the 916 Checkerboard V1 problem on CodeHS. Understand common issues and learn how to implement a working solution using a 2D array and nested loops."
function transitionToWest() turnLeft(); if (frontIsClear()) move(); turnLeft(); Use code with caution. javascript
Mastering CodeHS 9.1.6: The Complete Guide to Fixing the Checkerboard v1 Bug Remember that the first index is always the
Keep grinding on those Tracy the Turtle challenges! 🐢💻
We use two loops:
is , the cell gets the secondary color (e.g., White or false ).
The system wants to see you access a specific spot in a 2D list (e.g., board[i][j] = 1 The Solution: Step-by-Step Fix add(square); "Get the fixed code for the 916
This approach uses a nested loop as required by the CodeHS autograder.
Many coders struggle with the 916 Checkerboard V1 CodeHS challenge due to a variety of reasons. Some common issues include:
Using " ".join(...) ensures the output matches the expected CodeHS console format exactly, preventing "Output does not match" errors. Common Errors to Avoid