Scratch Debugging Examples: Learn to Identify and Fix Code Errors

📚 Quick Study Guide

🔍 Understanding Errors: Bugs in Scratch can be due to incorrect logic, faulty conditions, or misaligned blocks. 💡 Debugging Tools: Use the 'Step' button to execute code line by line. The 'Watch' panel is great for viewing variable values. 📝 Common Errors: Look out for infinite loops, incorrect variable updates, and logic flaws in 'if' statements. 🧱 Testing: Test your Scratch project frequently after making changes to catch bugs early. ⚙️ Decomposition: Break down complex problems into smaller, manageable parts to make debugging easier. 🐞 Rubber Duck Debugging: Explain your code to someone (or something!) else; often, the act of explaining reveals the error. 🛠️ Print Statements (Say Block): Use the 'say' block to display variable values or messages at different points in your code.

Practice Quiz

1. Which of the following is NOT a common debugging technique in Scratch?
   1. Using the 'Step' button
   2. Checking variable values in the 'Watch' panel
   3. Ignoring errors and hoping they disappear
   4. Using the 'Say' block to display values
2. What type of error is most likely if a sprite moves in the wrong direction?
   1. Syntax Error
   2. Logic Error
   3. Runtime Error
   4. Compilation Error
3. What is the purpose of the 'Step' button in Scratch?
   1. To run the entire program at once
   2. To execute the code one block at a time
   3. To automatically fix errors
   4. To delete all the sprites
4. How can you check the current value of a variable during debugging?
   1. By using the 'Hide variable' block
   2. By using the 'Watch' panel
   3. By deleting the variable
   4. Variables cannot be checked during runtime.
5. What is the likely cause if a loop runs forever in Scratch?
   1. A syntax error
   2. An infinite loop
   3. A runtime error
   4. All of the above
6. Which debugging technique involves explaining your code to identify errors?
   1. Reverse Engineering
   2. Rubber Duck Debugging
   3. Black Box Testing
   4. Pair Programming
7. If your sprite is not moving despite having move blocks, what should you check first?
   1. The sprite's costume
   2. The stage's background
   3. If the move blocks are inside a forever loop or triggered by an event
   4. The sprite's name