CS Level 1 - VEXcode VR Blocks

Unit 3 - Repeating Behaviors

# Lesson 2: Repeating Actions

Now that the VR Robot has drawn a square on the Art Canvas Playground using the Pen, you will learn to repeat blocks and simplify your project. This Lesson will walk you through the steps to draw a square on the Art Canvas Playground using the [Repeat] block.

## Learning Outcomes

• Identify how to use the [Repeat] block to repeat the blocks inside of it for a set number of times.
• Identify that the [Repeat] block can accept integers as parameters.
• Identify that conditions are used to end a [Repeat] block.
• Describe why a [Repeat] block would be used in a project.
• Describe the flow of a project that contains a [Repeat] block.

### Rename the Project

• Rename the project by selecting the project name box.
• Enter the new project name Unit3Lesson2, and select “Save.”

## Repeating Actions

The [Repeat] block is used to repeat the blocks within it a set number of times. The [Repeat] block saves time and effort while creating projects where blocks repeat. Rather than taking the time to drag in additional blocks or duplicate existing blocks in the workspace, the [Repeat] block can be used to save space and time.

• Begin by modifying the previous project or create a new project to match this base project.
• The repeated blocks in this project are the [Drive for] and the [Turn for] blocks. Remove the bottom six blocks in the project so only one [Drive for] and one [Turn for] block is left beneath the [move robot pen] block.
• Drag in a [Repeat] block. Notice that the [Repeat] block will create a gray shadow around the blocks that will be inside when placing the block in the workspace.
• Set the parameter of the [Repeat] block to “4” so a VR Robot draws all four sides of a square.

The [Repeat] block can accept integers. Decimals will not work as a parameter for a [Repeat] block.

• Select the “Open Playground” button to open the Art Canvas Playground if it is not already open.
• Select the “Start” button to test the project.
• Watch the VR Robot drive forward and turn right four times on the Art Canvas Playground to draw a square with the Pen.

Select the Next button to continue with the rest of this Lesson.