916 Checkerboard V1 Codehs Fixed -

Cracking the Grid: 916 Checkerboard v1 CodeHS Fixed If you’re working through the CodeHS JavaScript curriculum, Exercise 9.1.6: Checkerboard v1 is often the first major "wall" students hit. It requires you to move beyond simple loops and start thinking about 2D space, coordinates, and conditional logic.

/* * This program draws a checkerboard pattern. * The "Fixed" version ensures that rows alternate * regardless of the grid dimensions. */ 916 checkerboard v1 codehs fixed

• Corrected row/column parity checks
• Ensured square size calculation uses integer division consistently
• Added boundary checks to prevent off-by-one drawing errors
• Included two unit tests: even-width and odd-width boards

The most common mistake in "v1" is only checking if the column is even or odd. If you do that, every row will look identical, resulting in vertical stripes rather than a checkerboard. The Solution: Use the sum of the row and column indices. If (row + col) is even, color it Red. If (row + col) is odd, color it Black. The Corrected Code (JavaScript/Karel Style) Cracking the Grid: 916 Checkerboard v1 CodeHS Fixed

The Modulo Trick: Using (row + col) % 2 == 0 ensures that the 1s alternate correctly across both rows and columns. The most common mistake in "v1" is only

Common Issues with the 916 Checkerboard V1 CodeHS Challenge

} Use code with caution. Copied to clipboard Key Fixes Applied The "Double Move" Logic , checking frontIsClear() twice ensures Karel doesn't attempt to