Programming 102

1. Ship1 is using this code block. {"type":"wrapper","func":"valueSensingDistanceToSprite","values":[{"type":"string","value":"Moon"}]} What does this block do?

• It finds the distance from Ship1 to the moon.
• It tells you how long the moon is.
• It tells you how long the ship is.
• This code block does not exist.

2. True or False: You can only use functions in the Actor they were defined.

• True
• False

3. True or False: Pen drawings will remain on the Stage until you use the Clear block. {"func":"blockPenClear"}

• True
• False

4. Which block allows you to stop drawing?

• {"func":"blockPenDown"}
• {"func":"blockPenUp"}
• {"type":"wrapper","func":"valueSensingMouseDown"}
• {"func":"blockLooksChangeSizeBy","values":[{"type":"number","value":"10"}]}

5. In the Sky Train we created, we wanted the second train compartment to move towards the first train compartment when their distance between each other was greater than 150. What block of code helped us achieve this?

• {"type":"wrapper","func":"valueOpGreater","values":[{"type":"wrapper","func":"valueSensingDistanceToSprite","values":[{"type":"string","value":"train1"}]},{"type":"string","value":"150"}]}
• {"type":"wrapper","func":"valueOpLess","values":[{"type":"wrapper","func":"valueSensingDistanceToSprite","values":[{"type":"string","value":"train1"}]},{"type":"string","value":"150"}]}
• {"type":"wrapper","func":"valueOpEqual","values":[{"type":"wrapper","func":"valueSensingDistanceToSprite","values":[{"type":"string","value":"train1"}]},{"type":"string","value":"150"}]}
• {"type":"wrapper","func":"valueOpAnd","values":[{"type":"wrapper","func":"valueSensingDistanceToSprite","values":[{"type":"string","value":"train1"}]},{"type":"wrapper","func":"valueSensingDistanceToSprite","values":[{"type":"string","value":"train2"}]}]}

6. What are the benefits of functions?

• It shrinks the size of code blocks. This makes the blocks easier to read.
• We can reuse the function rather than rewriting the code over and over again.
• It allows you to test smaller portions of the your code rather than testing large blocks of code. This allows you to find bugs easier.
• All of the above

7. Our hero wants to go to town to buy supplies. He does not want to waste time by walking too far. Which of these code blocks will help him choose which of two towns is closer?

• {"func":"blockControlIfElse","values":[{"type":"wrapper","func":"valueOpGreater","values":[{"type":"wrapper","func":"valueSensingDistanceToSprite","values":[{"type":"string","value":"town2"}]},{"type":"wrapper","func":"valueSensingDistanceToSprite","values":[{"type":"string","value":"town1"}]}]}],"containers":[{"func":"blockMotionPointTowards","values":[{"type":"string","value":"town1"}]},{"func":"blockMotionPointTowards","values":[{"type":"string","value":"town2"}]}]}
• {"func":"blockControlIfElse","values":[{"type":"wrapper","func":"valueOpGreater","values":[{"type":"wrapper","func":"valueSensingDistanceToSprite","values":[{"type":"string","value":"town2"}]},{"type":"wrapper","func":"valueSensingDistanceToSprite","values":[{"type":"string","value":"town1"}]}]}],"containers":[{"func":"blockMotionPointTowards","values":[{"type":"string","value":"town2"}]},{"func":"blockMotionPointTowards","values":[{"type":"string","value":"town1"}]}]}
• {"func":"blockControlForeverIf","values":[{"type":"wrapper","func":"valueOpGreater","values":[{"type":"wrapper","func":"valueSensingDistanceToSprite","values":[{"type":"string","value":"town2"}]},{"type":"wrapper","func":"valueSensingDistanceToSprite","values":[{"type":"string","value":"town1"}]}]}],"containers":[{"func":"blockMotionPointTowards","values":[{"type":"string","value":"town1"}]}]}
• None of these code blocks will work.

8. True or False: This block {"type":"wrapper","func":"valueSensingDistanceToSprite","values":[{"type":"string","value":"hero"}]} can only find distances to Actors.

• True
• False

9. What will this block of code do when it runs? {"func":"blockControlIfElse","values":[{"type":"wrapper","func":"valueOpGreater","values":[{"type":"string","value":"a"},{"type":"string","value":"b"}]}],"containers":[{"func":"blockAnimationSimpleSwitchCostume","values":[{"type":"string","value":"Dance"}]},{"func":"blockAnimationSimpleSwitchCostume","values":[{"type":"string","value":"Jump"}]}]}

• It will animate Dance.
• It will animate Jump.
• It will animate both Jump and Dance.
• No animation will run because you cannot compare letters.

10. Can you compare letters with this block {"type":"wrapper","func":"valueOpGreater","values":[{"type":"string","value":"b"},{"type":"string","value":"a"}]}?

• Yes
• No