By moving twice inside the makeRow function, you automatically handle the "every other" logic without needing a complex "beeper-at-last-spot" variable. Common Pitfalls to Avoid
Using while(frontIsClear() || leftIsClear()) ensures Karel doesn't stop prematurely in rectangular worlds. 645 checkerboard karel answer verified
If you’re working through CodeHS, you’ve likely hit the assignment. It is widely considered one of the first true "logic walls" for students learning JavaScript or CoffeeScript. Unlike simpler tasks, this one requires a deep understanding of loops, conditionals, and—most importantly—spatial awareness within the grid. By moving twice inside the makeRow function, you
Ensure your putBeeper() command isn't inside a loop that runs twice at the corners. 645 checkerboard karel answer verified
This solution is robust because it uses and Post-conditions .