- Game Lab
- Drawing Shapes
- Shapes and Parameters
- Sprites
- The Counter Pattern
- Velocity and the Counter Pattern
- The Draw Loop
- Debugging with Watchers
- Animation Tab
- App Lab
- Responding to User Input
- Taking Input with getProperty
- Multi-Screen Apps
- Changing Screens
- Designing Screens with Code
- The Counter Pattern
- Design Mode
- If Statements
- App Lab Table Data Storage
- Maker Toolkit
- Circuit Playground
- Color Lights
- Playing Notes
- Analog Sensors
- Changing Sensor Scale
- Physical Input
- Producing Output
- Circuits and Buttons
- Circuits and LEDs
- The Accelerometer
- Accelerometer Events
- Board Events
- Data and Change Events
- JavaScript
- Booleans and Comparison Operators
- If Statements
- If-Else Statements
- For Loops
- Timed Loop
- Timed For Loop
- Variables
- Naming Variables
- Arrays
- Modifying Arrays
- Random Numbers
- Functions
- Patterns
- HTML
- CSS
- Patterns
- Counter Patterns with Event
- Variable with String Concatenation Pattern
- The updateScreen() Pattern
- Checking Multiple Conditions with If-Else-If
- Random List Access Pattern
- List Scrolling Pattern
- When to Make a Function
- Debugging Variable Scope: Functions
- List Filter Pattern
- List Reduce Pattern
- Other
- AI Lab
Concepts
Random List Access Pattern
| Name | Code (Block) | Code (Text) |
|---|---|---|
| Random List Access Pattern |  |
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How does it work?
Many App Lab projects run in the following way.
- The user is interested in seeing items in a list, like a list of favorite foods, or a list of reminders.
- The app shows the user one item in the list at a time.
- By clicking buttons (or otherwise interacting with the app) the a new random item in the list is shown to the user.
This pattern allows a user to see random elements in a list. In order to make it work, create an index variable and a list. Then generate a random number between 0 and the length of the list minus one and set the index to that value. Then update the screen.
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