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5. Lists Blocks: These blocks help you store and manage collections of items. You
can add, remove or find items in a list. Example:

create empty list Creates an empty list with no element.

length of list list Returns the number of items in the list.

6. Dictionaries Blocks: These blocks store data in key-value pairs. They help you
organise and access information using labels. Example:

This block creates a dictionary without any key-value
create empty dictionary
pairs.

remove entry for key This block removes the key-value mapping in the dictionary
from dictionary for the given key.

7. Colors Blocks: These blocks allow you to pick and use colours in your app. You
can set background colours or text colours using these. Example:

This basic colour block is a small square block that shows
a specific colour in the middle, representing the colour
stored inside it.

make color make a list 255 This block takes in a list of 3 or 4 numbers. These numbers
0
0 in this list represent values in an RGB code.

8. Variables Blocks: These blocks store values that can change while the app runs.
You can create, set and get variable values. Example:

This block allows you to access and use the current value
get
stored in a variable.

This block assigns a new value to a variable. Like the get
set to
block, only variables within scope appear in the drop-down.

Creating Apps with MIT App Inventor 133