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The Blocks Editor lets you program the app’s behaviour by putting blocks together.

Blocks Button

Built-in Blocks

Blocks

Component-Specific
Drawers

Viewer

The important sections of the blocks editor window:
Built-in Blocks: These are the basic blocks in MIT App Inventor (e.g., Control, Math,

Text) used to program app behaviour.
Component-Specific Drawers: Each component (e.g., Button, Label) has its own set of
blocks for controlling actions and settings.

Blocks Button: Switches you from the design area to the blocks area to write the app’s
code.
Viewer: The viewer is where you drag and drop blocks to create your app’s functionality

by connecting them like puzzle pieces.

DIFFERENT BLOCKS OF BLOCKS EDITOR

Built-in blocks are always available and provide basic tools for logic, text, variables and

more in the Blocks Editor.
1. Control Blocks: These blocks manage the flow of the program using conditions, loops

and event triggers. They help you decide what happens and when. Example:

Blocks Functions

if Tests a given condition. If the condition is true, it runs the
specified blocks; if not, it skips them.
then

if
Tests a given condition. If it is true, the blocks in the then part
then
run; if it is false, the blocks in the else part run.
else

122 Computer Science (V5.0)-V