Week 02 · Two Boxes, One Ship
Tuesday
Copy a box
// Copy one box and lower another
⏱ about 15 min
Copy a box!
Rocket has a plan for a test ship.
He wants its speed to match its height.
He could write the same number two times.
But Nova knows a faster way.
A line can copy one box into another!
Raven wonders if the first box goes empty.
WARM-UP: TWO BOXES
- Check the name tags.
- Tap what Nova says.
set height to 2
set speed to 6
say height
?
set speed to 3
set height to 5
say speed
?
Copy one box into another
Set speed to height copies a number.
Nova peeks in the height box.
Nova puts the same number in speed.
set height to 4 set speed to height say speed say height
What do you notice?
Height still holds 4.
A copy does not empty a box.
Now both boxes hold 4!
COPY THE BOX
- Read every line.
- Tap the answer.
set height to 2
set speed to height
say speed
?
set height to 5
set speed to height
?
set height to 3
set speed to height
say height
?
Build a copy test.
Speed must match height.
Nova says speed, then lands.
BUILD A COPY TEST
- Read each card.
- Fill, copy, say, then land.
1line 1
2line 2
3line 3
4line 4
The copy happens once
The copy happens when its line runs.
Later lines about height do not reach speed.
TRICKY COPIES!
- Track both boxes.
- Tap what Nova says.
set height to 1
set speed to height
set height to 4
say speed
?
set height to 2
set speed to height
change speed by 2
say height
?
Speed keeps its copy unless a line names speed.
| program | speed holds 4? |
|---|---|
| set height to 4, set speed to height | ? |
| set height to 2, set speed to height | ? |
| set height to 4, set speed to height, change height by 1 | ? |
| set height to 4, set speed to height, change speed by 1 | ? |
You copied a box!
Set speed to height makes a copy.
Height keeps its number too.
See you tomorrow, Crew!