Control Structures in App Inventor 2

To create apps that do more than just display information, you need to control the flow of execution—the order in which instructions (blocks) are run. Control Structures allow you to make decisions, repeat actions, and respond to events, making your apps dynamic and interactive.

Sequential Execution

The most basic flow is sequential execution. Inside event handlers (when ... do) or procedures, blocks are typically executed one after another, from top to bottom, in the order they are connected, unless a control structure alters this flow.

Conditional Execution (Selection)

These structures allow your app to make decisions and execute different code blocks based on whether certain conditions are true or false. They are primarily found in the Control category.