Class #7: Here's the Scoop

Here’s the Scoop
Week# 7
Sunday
11
April
2021
Pallab, India
9 am IST
Nardos, USA

Coolest Projects Competition
Registration is OPEN!
You can register to share your
creations in Raspberry Pi's
world-leading online tech showcase!
Raspberry Pi welcomes projects
from anywhere in the world,
whatever your experience level!

Reminder
Please be respectful and
appropriate with your
responses in the chat!

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1. Introductions
2. Week 6 studio time
3. Ice cream project
4. Game Time
5. Next week’s class

What you will learn
1. How to use lists
2. User input blocks

Meet the Mentors!
Starting with Scratch:

Mera
@MeraSeifu
Noora
@nooraabed
Abia
@abiazahir
Tanisha
@TanishaD11
Emanda
@emandaseifu
Vagish
@vagish
Pallab
@Pallab_Layak
Soham
@SohamDasgupta91
Nardos
@nardosd

Virginia, USA 11th grade
Listening to music & watching netflix

Karnataka, India 11th grade
Basketball, Rubix Cubes, Piano

Fun-ctions!
Week# 6
Sunday
4
April
2021
Noora, USA
9 am IST
Vagish, India

5. RockIt1234 6. scratch_aysha
4. @shridev
3. @ScratchWithLavanya

Coolest Projects Competition
https://coolestprojects.org/2020/03/31/how-to-make-a-project-workbook-and-additional-resources/

Coolest Projects Celebration!!
When will we
see which
projects are
picked as
favorites? June 8, 2021!

https://scratch.mit.edu/projects/508553933/
Advanced…..

The customer
is welcomed
into the shop
The customer
orders ice cream
from a menu of
delicious choices!
The customer
takes their
receipt and
leaves the store
with their ice
Customer -

Let’s break down the
customer’s….
Enter the shop Place the order Get the receipt,
leave

The owner
welcomes the
customer to the
shop
Tells the customer
about the ﬂavors of
ice cream available
to purchase and
takes the customer’s
order!
Gives the
customer a
receipt, and
wishes them a
good day
Owner -

Let’s break down the
owner’s….
Welcomes the
customer
Takes customer’s
order
Says good-bye

File Naming Protocol
Shop(Your first name)
● Example:
ShopAya

Head over to scratch and create a new project!

Project #1 File Naming Protocol
Shop(Your first name)
● Example:
ShopAya

Name your file using the class protocol
Shop(YourName)

The customer is
welcomed into the shop
Customer
The owner welcomes the
customer to the shop
Owner

Computer Science Design Thinking!
Research
details
about your
design
elements
Design with your
audience in mind
Plan your program. List
the details
Brainstorm.
Keep an
open mind.
Talk to
others.
Create and
then select
final ideas
Create draft #1 of your
program.
Test through the process.
Get user feedback to
improve your design and
use to improve you program
Start

Design Element: Understanding
● What other Scratch programs feature ice cream parlors?
○ What could I learn from looking at them?
○ Do those have any ideas that I would like to build on?
● Do I want to learn a skill that I do not have in order to create
this program the way I want?
○ Who could I get help from?
● How detailed do I want to do this program to be?
○ I am just doing this for fun - one and done
○ Spend lots of time with - I love this program
○ I am submitting this program to a competition and I want to do
my best

Design Element: Empathize
● What will make the program fun for the player or my game?
○ Do I need to keep score?
○ Does it need a timer?
● How many time do I want someone to play my game?
○ If I got 50 views I would be happy
○ I am using this to build my STEM skills
○ I am using this to demonstrate my coding skills. I want a
summer internship!
● How can I get feedback on my game so I can make it better?
○ Can I ask my family, my friends? Will they tell me the truth?
○ Did I get any online feedback? Is it reliable?

The customer is
welcomed into the shop
Customer
The owner welcomes the
customer to the shop
Owner
Design Element: Deﬁne

Customer Owner
Both
1. What makes the
customer go
into the store?
2. What types of
ice cream are
they looking
for?
1. What type of
door do I want?
2. What fonts
“look like ice
cream?”
1. How can I design the
store to look inviting
to customers?
2. What money am I
going to use in my
story?
Design Element: Ideate

Design Element: Prototype
● What elements of my game needs to be tested?
○ How can I college the feedback?
■ Survey?
■ Verbal comments?
● How quickly can I incorporate the changes I want to make?
○ I need a week?
○ I will do them right away
○ I need training before I can finish the changes

Design Element: Prototype
● You need to test your program throughout the time you are
creating it.
○ Frequent testing is an effective way to catch mistakes (debug)
before you run into problems
● How long am I going to test before I start the next draft or
begin a new project?
○ Am I competing in a competition? When is the due date?
○ Is this project for my computer science class? When is it due?
○ Am I just doing this for fun?
○ Am I working with a partner/team? What do they think?

Our planning is done….for now. Let’s begin to code our
program! We won’t need the cat sprite so let’s delete it!

Step 1: Show the customer
is hungry and they want to
go get ice cream
Step 2: Show the front of
the store and allow the
customer to enter when the
space bar is clicked
Step 3:
The owner
waves and
welcomes the
customer

We need to make our own backdrop so let’s click on “stage”
and under the backdrops tab, click “choose a backdrop”

We need a plain screen for the player to think they’re
hungry so I’m picking the “blue sky”

Name the backdrop “start.” Now you can click on the fill
button and choose a color for the backdrop

Once you pick the color you want, click on the text option
and to make the text readable, change the fill color to black

The player thinks they’re
hungry so I’m going to write
“hmm..I’m hungry”
Then pick the font you like, I
choose “Marker”

To introduce the ice cream shop,
add another text that says “I’m
going to go get ice cream”
Then pick the font you like, I
choose “serif”

Now we can switch to the code tab and add our sprite.

Look at all the options and pick the sprite you want for your owner

I’m going to search for “Dani” and pick this sprite

Now the sprite shows up on the stage but it’s a little too big...we
can change the size below the stage
70

Let’s check out the sprite’s costumes

We only need one of costume. I am going to
choose the “Dani-b” costume and delete the rest

The goal of the owner is to welcome customers. In
order to achieve that goal I am going to make the
sprite wave to the customer. The first step is to
duplicate the costume twice

Tip: It is much easier to change parts of
the sprite under Bitmap

You will see this toolbar in Bitmap, choose the select option
so we can move the sprite’s arm from the elbow down
1. Paintbrush tool
2. Circular tool
3. Text box tool
4. Eraser tool
5. Line tool
6. Box tool
7. Fill tool
8. Selector tool
1.
2.
3.
4.
5.
6.
7.
8.

Choose the tool and then select the sprites
hand from the elbow down

Rotate the arm up into a
waving position
Use the eraser tool to
clean up the areas around
the arm
Name the costume “waving” so you can identify it when you code

Duplicate the waving costume and use the selector tool again
Rotate the arm and adjust it to fit normally where the hand is closer to the sprite’s face

Go back and make sure to name
the first sprite “standing” Now let’s switch over
to the code tab

We don’t want the store owner, Dani, on the starting page
(that is the customer talking) so let’s hide her by getting the “when
green flag clicked” block followed by “hide”

Because we will be changing the backdrop later (inside store backdrop vs outside
of the store backdrop), let’s make sure the program starts on the backdrop we
want by adding the “switch backdrop” block
Test Your Code!

YEAAA It works! Now the sprite is hidden and we can
go to the next part of our story!

For step 2, we need a new backdrop so go over to the backdrops
and click “choose a backdrop”
customer to enter when the

We need a blank backdrop for the front of the store

Name the backdrop “Front”
and select the text box to type
the name of the shop
Add the name of your shop
and you can change the font,
color and size to whatever
you like!!!
Front

I have a brilliant idea! Why don’t we add a door for the shop that opens
when the customer wants to enter the store?
What else can we do to add a door
to the beginning of our program?
Backdrops don’t move

We can use a door sprite that has an open
and closed the door costume!
You have two options:
1. You can upload a door
from google images as a
sprite
2. OR you can “backpack”
sprites from the project
named “BackpackItems” in
the Class 7 Studio.
https://scratch.mit.edu/studios/28848144/projects/

Click the “see inside” button to add the
sprites for this week’s class

Backpack
1. Click and drag the door
sprite into your backpack
2. There are multiple sprites
that we will need later
on, so just add them all
to your backpack now.

Under costumes, we can take a closer look at the
door!
CloseDoor OpenDoor

Let’s go back to this week’s project and drag the door
sprite out of the backpack onto the stage...

Hmm...we can’t see the door sprite on the stage so
let’s switch to the door workspace

Oh look! There is already code here...when you backpack sprites,
all the code written on the sprite’s workspace is backpacked with
it!
● Do we want to keep this
code?
○ YES!! When the
program starts, we are
on the “start” page
with no sprites!
● When should the door show
up?
○ When the backdrop is
on the “Front” page
we just created so
let’s add the code for
that!

For the door sprite to show up on the “Front” backdrop, add the “when
backdrop switches to” event block followed by the “show” block
door sprite
workspace
door sprite
workspace
Test
Your
Code!

Nothing happens! This is because we are on the “Start” backdrop.
We need to switch to the “front” backdrop, so let’s go over to the
owner Dani’s workspace!
We are here….. We need to be here…..

First we are going to add a wait block - giving the player
time to read the information on the backdrop…..
by adding a
“wait” block
Let player read information on
the backdrop..
Test
Your
Code!

..then we are going to test the time required to read
the backdrop and then change to the “Front” backdrop
Change the wait to 2
seconds so the customer
has time to read...
….then add the “switch
backdrop to” block and
select “Front” Test Your Code!

Oh NO! The door appears in the middle of the screen and it’s
open...what can we do?

Drag the door to the location you
want it to be seen
Add the “go to” block that
matches the coordinates of
that location
From the door sprite workspace drag the door to the
“proper” location and secure it with the “go to xy” block

When the door first shows up, we want the player/customer to have
the fun of opening the door so it feels like they are walking into the
store - so we’ll use the “switch costume” block and select “CloseDoor”
Open door Closed door
Test Your Code!

WOOHOO!!!!
● Humm… How can the
player/customer open
the door to go inside
of the store???
○ We can use the
spacebar!

● This event block allows
code to run
○ But ONLY when the
computer recognizes
the spacebar is pressed
Add the “when space key pressed”
block followed by “switch costume
to” and select “OpenDoor”

WAIT!! As excellent programmers, it’s our job to tell the
player/customer how to use the program so let’s add instructions to
the “Front” backdrop
As always, you can
change the font, color
and size of this text!
Test
Your
Code!

It works!!! We are now done with the beginning of the story!
Introduce the program and
the front of the shop

Click on “stage” and under the backdrops tab, click
“choose a backdrop”

I like the blue color so I’ll start with the blank “Blue Sky 2” backdrop again

We can name this backdrop “store” so we can remember what
it is in the code tab
Notice that the backdrop is
currently in Vector format.
To convert to Bitmap format
you would have to click on
the button.

In every movie that I have ever seen the ice cream shop has a
checkered floor! We have to continue the legacy - right!
Use the box tool and change the fill color to what you want

Place the first box in the bottom right corner, then copy it
so you can fill up the floor faster
Tip:
use ctrl + c
keys on your
keyboard to
copy

Start pasting the boxing and place them diagonally from one another.
Then you can select both rows and copy them

Paste twice and position the rows to create a checkered look
Tip: If you leave the top
section of the backdrop
empty then you can put
the name of the shop
there!

To create the banner for the name of the shop….
You can select the box tool and
change the fill color
then draw a box over the
blank top space

Now it’s time for the text….
Use the text box tool and change
the color to black so it is
readable on the baner
Then type out the name of
your shop

Now you can change the font, color, and size of the text until it’s
to your liking -

….don’t forget to delete the extra backdrop we aren’t using!

Backdrop Key!
Start Front Store

AWESOME!!! ...Now we can go to Dani’s workspace to switch to the Store
backdrop when the spacebar is pressed
Don’t forget to Test Your
Code!

Uh Oh! The door
shows up in the
store
AND
it opened after the
backdrop switches….
1
2

The door will disappear when the store backdrop is showing, so
A. add the “when backdrop switches to store” block and
B. then add a hide block
1
Code!

Under the owner Dani’s sprite workspace, if we add a wait block
we can see the door open BEFORE the backdrop switches!
* You can adjust how long the wait lasts until you like it.
2
Code the wait block STEP 1: Door closed
STEP 2: Door open
Wait Block
Command executes
The STORE
backdrop displays!
Make changes on
Dani’s workspace

It works!! We are in the store! Now we want Dani be inside
of the store, ready to greet customers! Go to Dani’s
workspace and add the “show” block after switching the
backdrop to the store
The STORE
backdrop displays!
Dani is in the store!
Code!

Hummm...how could we design the store that is attractive
to the customer? Let’s add a counter?
● Tip: You can’t layer items on a backdrop
○ So we can make a counter sprite!
Counter

Select the box tool, change the fill color and make 3
rectangles in the shape of a counter
I chose red, but you can make the counter any color you like!

Now let’s switch over to the “counter” sprite and make
sure that it shows and hides on the right backdrops
Perfect! No counter
sprite showing on either
of these backdrops
1
2
This is the starting screen when
the green flag is clicked
No sprites are supposed to
show up on this page
....the counter needs to show!
When the store backdrop presents....

Don’t forget to move the Dani sprite to her “customer”
greeting locating by using the “go to xy” block!
Test
Your
Code!

Whoops! Dani is still in front of the counter! To place her
behind the counter you need to use the “go to ()layer block...
The block allows you to layer
sprites in the order you want.
● In this case, we have the
counter in the front layer
so that the owner can be
behind it.
Test
Your
Code!

The plan is to have Dani wave hello to customers as they
enter the store so we have to create her wave!
Add the switch
costume to standing
block
Then add a wait block
before having the sprite
wave
Make changes on
Dani’s workspace
Test
Your
Code!

Test
Your
Code!
To create a waving effect, we can switch between the two
waving costumes and add a wait block between them!
Standing
Waving
Waving2

The code kind OK but could we improve it? We need to end
in a standing position and the hand waving isn’t clear...

Why don’t we put the switch costume blocks in a loop?
1. We can repeat these
blocks of code twice
to see if that makes it
look more like
waving!
2. Then add a switch
costume to standing
block after the loop!
Don’t forget to
Test Your Code!

...the waving
is a little slow
so why don’t
we speed it up
by reducing
the time on
the wait
blocks?
The code working but...
Test
Your
Code!

Perfect! Now Dani can say hello and welcome her
customers into the store!
1. We can enhance the
customer/player’s
experience of being in a
store by having Dani
verbally great her
customers while she is
waving….
2. ...and having her change
positions while she is
talking!
Don’t forget to Test Your Code!

Step 1: Show the customer
is hungry and they want to
go get ice cream
player to enter when the
Step 3:
The owner
waves and
welcomes the
customer

Step 4:
Show menu and ask which
flavor the customer wants
Step 5:
Show the ice cream the
customer asked for and
their receipt for them to pay
Step 6: Show
the front of the
store again

BUT WAIT!!! We don’t have a menu yet!
● What does a menu do?
○ It organizes food
items for people to
look at
● BUT how can we make
our own menu in
Scratch (computer
science)?
○ We can make a list!

Huh????.....but What are lists?
● A list or sequence that represents a countable
number of ordered values, where the same
value may occur more than once.
● A list is a sequence of variables grouped together
under a single name.
● A list is a container that holds other values.

Lists in the real world
The Patel’s
● Mother
● Father
● Child

What characteristics do lists have?
● An identifier
○ Lists, like variables, have
identifiers or names that
allow us to remember what
we are storing
● Numbers for each item
○ For example, “milk” is item
#2 in this list
○ This allows us to easily access
items in the list
● A length
○ The size of a list = the
number of items in it
Let’s look at this example

● There are TONS of
lists blocks in Scratch
● We will explore some
of them
○ But be curious
and try out
different things
on your own and
see how it works
Lists in Scratch...what can you do?

3 Steps to make a list in Scratch
(It is just like the variable making process)
1 2
3
Go to the
variables tab
Select “Make a List”
under all the variable
options
Now we can name the list..in this
case “menu”

Just like variables, the blue check mark
allows us to see the list on the stage
1
2
3
1. The name of the list shows
up at the top
a. This allows us to
identify the list we
need when using
multiple lists
2. The middle section is where
the items of the list are
shown
a. The list is currently
empty
3. The amount of items in the
list is shown as the “length”
a. An empty list has a
length of zero

We can move the “menu” list to where we want it to show up on
the stage and we can even decide when we want it to show/hide
I can move the list to make sure
it doesn’t cover the banner of
the shop
Using this block
allows us the show
the menu list at any
time in the program
Using this block
allows us the hide
the menu list at any
time in the program

Given our plot, when should the menu (list) appear?
1. Do we need the list when we first
enter the store?
a. NO!! We want to make sure
the owner greets the
customer first
b. Up until this point, we need
the list to stay hidden
2. Should the list appear when the
owner asks the customer which
flavor they want?
a. YES! Customer should be able
to look at the menu and
choose what they want.
Step 3:
The owner waves
and welcomes the
customer
Step 4:
Dina shows customer
the menu and ask
which flavor the
customer wants
1 2

Now let’s switch over to the Dani’s sprite and make
sure that the menu hides on the right backdrops
Perfect! No menu/list showing on either of these backdrops!
This is the
starting screen
when the
green flag is
clicked
No sprites or lists are
supposed to show up
on this page

Now we can start adding items to the list! What kind of ice cream
do you like? What flavors should Dani offer to her customers?
● This block adds the “thing”
you want into the list
selected
○ For this project, we can
use this block to add the
different flavors we
want to the menu list
Test
Your
Code!

Yay!! Our menu is completed!
Now Dani needs to be programmed so that she can ask her customers to
look at it and pick which flavor ice cream cone they want to order!

Before we ask for which flavor the customer wants….
● Go back to the code where Dani talks... we can
have heri continue moving and then say that the
shop has lots of flavors for a certain price!
○ I chose to have each ice cream cost 150
rupees, what price will you choose?
● Then we can introduce the menu and
add the “show list” block to make the
menu visible
Test Your Code!
2
1

OH NO!! When the menu shows up, it the flavors we added
over and over again! Why is this happening?
The flavors we
originally
added….
The 3
flavors we
added
listed 3
times!
● Each time we test the code,
the list never clears. It just
adds the 3 flavors over and
over and over again!
○ So..We need to delete
the items in the list
every time the green
flag is clicked BEFORE
adding the flavors in
again
● The “delete all of” block
allows you to delete all the
items in a list

Congratulations - it works!!!
WOW! Look at all the code we’ve written for Dani!
Remove Dani
from 1st
page/Start
backdrop
Wave to customers
Say hello to
customers. Ask
what their order is
Create menu of
ice cream flavors

Helping you with step #2 is a bit complicated.
We want to make SURE we are being as clear
as we possible can SO we are going to
1. Give you an overview of what is
coming next and then
2. Teach you how to code everything
needed to make your program work
Our hope is that this technique will help you
understand what you are doing as a
programmer and how your code affects what
the computer is doing even when the code
looks complicated!

When you have successfully
created a function you will
see a define block in your
workspace and
Overview: Taking the Customer’s Order!
This block
“Calls the function”
A block with the name
of your function will
show up under your My
Blocks tab
|----------------------Create a function----------------------|
“Hello?” You
want me to
ask the
customer what
flavor ice
cream they
want? OK!
Bye.!
The customer
types in the
flavor of ice
cream they
want into the
computer...
Is that
ﬂavor on
the menu?
Process begins!
The

Now let’s create a function for the process of asking and picking
flavors! (Why? it will be more organized and easy to debug!)
1 2 3
Go to Dani’s
workspace and under
My Blocks, click on
“Make a Block”
Then you can name your block, I’ll
say “pickFlavor”
You will know that you
are successful when
this block will show up
in Dani’s workspace

To define the block, let’s ask ourselves exactly what this
function needs to do????
1. Ask what flavor the customer wants
a. Store that flavor into a variable so that other sprites (like
the cone) can access it
2. Check if the flavor selected is in the “list”
a. If it is in the list, the owner can repeat it back to the
customer, then broadcast a message for the cone to show
b. If the flavor selected is NOT in the list, tell the customer
the shop does not have that flavor available and to please
pick another flavor
3. Repeat step 1 and 2 until the customer has gotten their ice
cream

Ask what flavor the customer wants...
1. Programmers have LOTS of choices but
they can decide to let the user have
choice as well!
2. There are two blocks in Scratch that
help programmers ask the user
questions
3. The “ask and wait” block allows the
programmer (YOU!) to ask the user a
question with a pop up where they can
answer
4. Their answer is then stored in this
temporary variable that Scratch
created called “answer”

Ask the customer what flavor they want!
After using the ask block…
...we can store the answer in a
variable…..
...this allows us to know which flavor the
customer ordered when it’s time to give
them their ice cream cone order.

3 Steps to making a variable
1 2 3
Go to the
Variables tab
Click on “Make
a Variable”
Name your variable. I am
calling mine “flavor”
flavor

Now we can set the flavor variable to whatever the customer
answers as the flavor they want
Remember to leave the
variable check box
blank because we do
not want the variable to
be visible on the stage
Test Your Code!

We never called the function and the story is going fast! Let’s use
a wait block to slow the story then call the pick flavors function!
Test Your Code!
When you have successfully
created a function you will see
a define block in your
workspace and
A block with the name of your
function will show up under
your My Blocks tab
This block
“Calls the function”
This is
the
function

It works! Now it is time to decide what happens after the customer
answers the question! Let’s review the purpose of this function:
2. Check if the flavor selected is in the “list”
pick another flavor
cream

Overview: Is that flavor on the menu?
Let’s look at what this “if-else”
block allows us to do!
...and the
flavor is
added to the
customer’s
receipt….
You
picked
vanilla
Dani repeats the
order back to the
customer
YES!
The customer types in their order
for a vanilla ice cream cone…..
Does
Vanilla
exist in
the menu
list?
...and the
customer’s
order shows
up on the
counter!
YES! response
Page 1 of 2

Overview: Is that flavor on the menu?
The customer types in
their order for a mango
ice cream cone…..
Does
Mango
exist in
the menu
list?
NO!
No! response
Page 2 of 2
Does
Mango
exist in
the menu
list? NO.
Let’s look at what
ELSE this “if-else”
block allows us to do!
Dani asks the customer
“Which flavor ice cream
would you like?”
YES!
Then you would go
through the process
outlined on Page 1 of 2

Use an “if-else” block where the condition is the flavor chosen existing in
the menu
● This block checks if “thing”
exists in the list menu
○ We can use this block
to check if the answer
is a flavor in the menu
○ If it’s not in the menu,
the owner will have to
say that to the
customer

Just like most stores, I want the owner to repeat the order
back to the customer but how can I use both the variable
“flavor” and type in the say block?

● This block puts
together two
words/sentences
○ The block
comes with
apple, banana
○ “apple ” +
“banana” =
“apple banana”
Inside the “then” of the if-else block, use the
“join” block to say “you picked ” + flavor
(variable)

If the condition is NOT met (the flavor is not in the menu)
then the owner can tell the customer to try again!
Test Your Code!

Take a look at the result when you test the code
This version is when the customer enters a
flavor that exists in the menu. Why don’t we
show the ice cream the customer orders?
This version is when the customer enters a flavor
that DOESN’T exist in the menu. The owner says
to try again but the question disappears.

When the customer enters a flavor that DOESN’T exist in the menu,
we need to keep asking the question until a condition is met
● This process happens
over and over again
so we can use a loop!
○ We can use the
“repeat until”
block
● What condition do we
need for the loop to
stop?

We need a way to know if the customer picked a flavor that is
offered in the menu
1. The next step in our
planning process shows
that the owner shows a
receipt to the customer
a. So we can make a list
for the bought items
and ONLY ADD to it if
the flavor the
customer wants is
offered in the menu
The next step in our plot! I have an Idea

To make a list for the bought items, we’ll follow the three
steps to making a list!
1
2
3
Go to the
variables tab Select “Make a List”
under all the variable
options
Now we can name the list..in this
case “BoughtItems”

The boughtItems list shows up on the stage
1. We don’t want to show this list in
the program yet
a. We can uncheck the blue
mark next to the list name
b. AND add the
block when green flag is
clicked, so the list stays
hidden in the beginning of
the story UNTIL we need it to
be visible.

Add the “hide list” block to the code that runs when green flag
is clicked

We know from the “menu” list that a list needs to be deleted so it is
empty everytime we restart the code, add the “delete all” block
Test
Your
Code!

Now the list is hidden!! Let’s add the flavor variable to
the bought list inside the if statement

Now when the customer enters a flavor that DOESN’T exist in the
menu, we need to keep asking the question until there is at least
one item in the “bought items” list

The block allows us to use how long the
list is (how many items it has) in our code
Test
Your
Code!

Back to the purpose of this function....
2. Check if the flavor selected is in the list
pick another flavor
cream

YAY!! It works! Now we can add ice cream to our project so it shows
up when the customer orders it from the menu
1. We need to have ice
cream show up when it
is ordered
correctly...how can we
do this?
a. Let’s broadcast a
message
b. BUT WAIT!! We
need an ice cream
sprite first!

Before we move on to the ice cream
sprite….
1. We will break down the
process to make it easier to
understand
2. We hope that this will help you
get creative and really
personalize your ice cream
shop!

1. Duplicate
2. Change color!
Wait!!!! We need to make the ice cream cones!!! showCone
Scratch
regchocolate regstrawberry regvanilla
1. Duplicate
2. Change color!
This costume has
been provided to
you in the class
backpack!
Use it to make your
other ice cream
cone flavors!

Let’s get started by dragging the ice cream cone to the stage!

Look!! The sprite
already has code to
hide it in the
beginning of the
story...now we
need to tell it when
to show up….
….go back to Dani’s workspace so that we can
broadcast a message to show an empty cone BEFORE
asking the customer what flavor they want!

Under the drop down menu of the broadcast block, we can make a new
message

Name the message
“showCone” so we can
identify it, then click OK.
Now the message “show cone” is
selected on the broadcast block

Then we can broadcast ANOTHER message to show the flavor AFTER the
customer answers which cone they want AND it exists in the menu
This means we
need to
broadcast a
“show flavors”
message INSIDE
the if-then block

Now we can go to the
cone sprite workspace and
add a “show” block after
the “when I receive
showCone”
1. When the
“showFlavors”
message is
broadcasted, we need
to show the ice cream
that the customer
ordered
a. Let’s take a look
at the costumes
and make the ice
cream flavors we
need!
We can also drag the
“when I receive
showFlavors” block

Go to the costumes tab... LOOK we have an
empty cone and a vanilla ice cream cone!
Scratch

Let’s duplicate the vanilla costume, make the chocolate and
strawberry ice cream, change their color....
The fill option
allows us to change
the pixels of parts
of the sprite
Play
around
with the
colors until
you get the
shades of
you like

...and then change their name! EASY!

Now we have all our
costumes! Let’s go back to
the code tab and make
sure we start with the
empty cone
The if-then block allows
us to run a block only
when a condition is met.
Now how can we show the flavor the
customer ordered?
What can we use for the condition?
1. The variable “flavors”
2. The menu list
3. The brought items list

We can use the variable and check if it equals a flavor
Use the equal sign to compare the
variable to “vanilla” for the condition
Add the “switch costume to” block
and choose the vanilla costume

Now we can duplicate the code and change the condition and costume
to the other two flavors!
Test Your Code!

It works but the cone shows up in the middle of the
stage...

Let’s move the cone where we want it to be and use the
“go to x: y:” block in the before it is visible
Test Your Code!

To show the receipt, let’s go back to the owner,
dani, sprite workspace
But first, the menu is still showing so let’s add the “hide list” block after calling the
pick flavors function

TIP: Our code is getting long and complicated, to make it more
organized, let’s create a “checkout” function to show the receipt
and handle the payment
1
2
3
Under My Blocks, click
on “Make a Block”
Then you can name your block, i’ll
say “checkout”
Lastly, this block will
show up in the
workspace

What does the checkout function do?
1. Show the receipt
a. Tell the customer that the owner has the receipt
and show the “broughtItems” list
2. Have the customer pay
a. We will need to add money that shows up after
the owner says how much it costs
b. Have the money disappear after a short time
3. Thank the customer and wave goodbye

Let’s start by introducing and showing the receipt
Test Your Code!

Oh NO! We forgot to call the function!
Test Your Code!
1. Use the “Checkout”
function to call the
function
a. This way the code that
defines the function
runs
b. AND the owner show
the customer their
receipt!

Now the checkout function is running!
The “broughtItems” list shows up in
the middle of the screen
You can move the list to the left side
and use the sides to make it smaller

Next the owner can tell the customer how much they need to
pay

In order to pay, we need money!! Let’s drag the money
sprite form our backpack into the stage

We should also add a register for the owner to accept
the money!

Let’s start by making the register show up when the
backdrop switches to the store!
When we test the code, the
register isn’t on the counter so
move it to the edge of the counter
Then add the “go to x: y:”
block before making the
sprite visible
Test Your
Code!

Now let’s go back to the owners workspace to tell the
money sprite when to become visible
Add a broadcast block and
click new message
Name the message something we
can identify like “showMoney”
Now your code should look
like this

While we’re here, the money doesn’t have to show up and
we can broadcast another message for it to disappear
Wait for 2 seconds for the money to be
seen, then have the owner say thank
you
Add another broadcast block and create a
message for “hideMoney”

Now let’s switch to the money sprite and have the
money appear when we broadcast “showMoney”
Test Your
Code!

The money shows up in the middle, let’s move the money next to the
register so it looks like the customer is paying

We can also add the code to hide the sprite when it receives the
message to “hideMoney”

The register is also hidden by the counter, let’s go over
to the register sprite and bring it to the front layer
Test Your
Code

The money is also a little hidden, let’s go to the
money sprite and add the “go to front layer” block
Test Your
Code!

First let’s have owner hide the receipt and wave
goodbye to the customer
Use the “hide list” block to
make the receipt invisible
Duplicate the loop we
coded to wave in the
beginning Move the loop to the end
of the checkout function
Test Your
Code!

Great Job!!! Now let’s make the last screen, go to
backdrops and duplicate the storefront backdrop
End

Use the selector tool and change the message at
the bottom to a nice goodbye to the customer

WOAH, there are so many sprites on the stage! Let’s look
at what should be shown/hidden on this backdrop
● Dani (the owner): hide
● Register: hide
● Counter: hide
● Ice cream: hide
● Door: show with closed
costume

Let’s start with Dani’s workspace
Start by switching backdrop to End
Then add the hide block!

Now to counter sprite workspace
Hide the sprite when the
backdrop switches to the end
screen
We will repeat this code for the other
sprites so drag this code to your
backpack

Drag the code from the
backpack to the sprite
workspaces
Drag the code from the backpack to
the money sprite to the register
For the Ice cream sprite….
● We can hide it when the
money sprite disappears
○ This will make it look like
the customer took their
ice cream after they
finished paying
● Drag the “when I receive”
block and select “hideMoney”
then hide the sprite

Now on the door workspace, since we are dealing with the front
of the store again, let’s switch to the “CloseDoor” costume and
show the sprite
Test Your
Code!

Why don’t we enhance the story with some music?
Under the owner’s workspace, go to sounds and delete the pop sound because we will not
be using it

Click on choose a sound and
explore your options!
I’m going to go to the loops,
section and pick “BassaNova”

Let’s go to the code tab to play the music and use a
forever loop so it can play in the background
We will loop through the sound over and
over again but when we switch to the
end backdrop, we can use the “stop all”
block to stop the music!
Test Your
Code!

Congratulations!!!
You did it!
Demo
Over

www.menti.com
Code: 33 97 50 5
https://online.coolest
projects.org/

Scratch Lesson 8:
Kites, Cookies, or
Samosas!
Join us next week for…..

Class #7: Here's the Scoop

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