ELEMENT COURSE – SCRATCH –
Programming Concept
Learn the If concept in programming.
LEVEL
開発環境
SCRATCH
1. What is “If”?
Again, let’s start with a daily life example to explain what “If” is:
You are having an exam in school.
“If” you focus on your exam (Hit “SPACE”) you get points.
“If” you cheat (Hit “C”) you get caught!
Note: Press the green flag to restart the demostration.
Note2: Do not cheat in school!
When we use “If” in programming, “If” is able to:
Reads the condition => Shows the right result.
Case 1: “If” no key is pressed => Nothing happens. Point stays Zero. 
Case 2: “If” “SPACE” is pressed 
=> Score goes up 
, Smiley face 
when reached 100 points
Case 3: “If” “C” is pressed 
=> Immediately caught by teacher 
2. Look into the code!
In Scratch, there are 3 types of “If”. They are:
They are all “If” functions but slightly different than each other.
The boy is trying to catch the falling egg.
If the egg falls on the right side 
,
then the boy goes to the right 
.
If the egg falls on the left side 
,
then the boy goes to the left 
.
Let’s see how 
is applied in the code:
If the egg falls on the right side 
,
the boy will use 1 second to go to right side 
.
If the egg falls on the left side 
,
the boy will use 1 second to go to left side 
.
This is an exact same example with the previous one,
but with a different coding using :
If the egg falls on right side,
then uses 1 second to go to the right side.
If the egg DOES NOT fall on right side,
then uses 1 second to go to the left side.
The guy wants to cross the road.
Let’s see how is applied:
1. If the signal stays Red 
, stay and wait on this side of the street.
2. If the signal turns green 
, walk across the street.
3. Do it yourself! (Coming soon)
Try making your own project using If .