Scratch: Chapter 3--A Review of the Basic Components of Scratch Projects

Boolean

A form of data with only two possible values (usually "true" and "false").

Clone

A temporary copy of a sprite that can be used to add instances of sprites to Scratch projects when they execute.

Sprites

A two-dimensional image drawn on a transparent background: this image is the default.

Looks Blocks

Code blocks that affect sprite and backdrop appearance and can display text.

C Blocks

Code blocks that are used to set up a loop of blocks within scripts that repeatedly execute for as long as a tested condition evaluates as true.

Motion Blocks

Code blocks that control sprite placement, direction, rotation, and movement.

Sound Blocks

Code blocks that control the playback and volume of musical notes and audio files.

Cap Blocks

Code blocks that halt the execution of scripts.

Reporter Blocks

Code blocks that has rounded sides and is specifically designed as a mechanism for providing input for other code blocks to process.

Operator Blocks

Code blocks that perform logical comparisons, rounding, and other arithmetic operations.

Control Blocks

Code blocks that repeatedly execute programming logic using loops or perform conditional logic.

Boolean Blocks

Code blocks that return a value of true or false.

List Blocks

Code blocks that store and retrieve lists of associated data.

Variable Blocks

Code blocks that store and retrieve string and numeric values

Events Blocks

Code blocks that trigger script execution.

Sensing Blocks

Code blocks that you can use to determine the location of the mouse pointer and its distance from other sprites and to determine whether a sprite is touching another sprite.

Pen Blocks

Code blocks that you can use to draw using different colours and pen sizes.

Data Blocks

Code blocks that you can use to store data used by applications when they execute.

Stack Blocks

Code blocks with a notch at the top and a bump at the bottom.

Hat Blocks

Code blocks with a rounded or curved top and a bump at the bottom, visually indicating that it can be snapped on top of other blocks.

Arguments

Input that code blocks accept: six types--numeric, string, drop-down, Boolean, and colour.

Default Value

Preset values assigned to code blocks that process argument data.

Scripts

These are collections of code blocks that snap together and are used to animate, control and change the looks of a sprite or background.