Week 01 · Memory and the Missing Bug
Thursday
Change the box by one
// A memory box holds one number
⏱ about 15 min
Add one to the box!
Rocket has a new idea for the auto-pilot.
He wants the ship to climb a little more.
Can a line add one to a box?
Nova beeps. Yes, it can!
Coders call it changing the box.
Rocket cannot wait to try it.
WARM-UP: NEWEST NUMBER WINS
- Read every line.
- Tap the answer.
set height to 4
set height to 1
?
set height to 2
set height to 6
say height
?
Change by one
Change height by 1 adds one.
The box held 2.
Now it holds 3.
set height to 2 change height by 1 say height
Nova keeps a logbook
After line one, the box holds 2.
After line two, it holds 3.
Nova peeks and says 3!
WHAT DOES NOVA SAY?
- Track the box line by line.
- Tap what Nova says.
set height to 5
change height by 1
say height
?
set height to 1
change height by 1
change height by 1
say height
?
set height to 3
change height by 2
say height
?
Build a flight up 4 spaces.
Start the box at 3.
Then add one before Nova flies.
BUILD A FLIGHT UP 4
- Start at 3, add one, fly, land.
1line 1
2line 2
3line 3
4line 4
What do you notice?
What if a change line goes missing?
The box would stay stuck.
Raven writes that down as a clue.
set height to 4 change height by 1 change height by 1 say height
Each change line adds 1 to the box.
| after | box holds | true? |
|---|---|---|
| line 1 | 4 | ? |
| line 2 | 6 | ? |
| line 3 | 6 | ? |
| Nova says | 5 | ? |
You changed the box!
Set fills the box.
Change adds to the box.
A logbook tracks every line.
Tomorrow: your own flights!