Scratch programs follow a very simple sequence:
- Start;
- Execute commands;
- End.
This means we have blocks that fall into each of these 3 categories.
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- #1573
- 20 Mar 2020
Start blocks
Start blocks have a convex round shape on the upper side:
Each of these blocks contains a condition along the lines of "When a button is pressed" or "When the program starts" and they activate the commands attached underneath them when their condition is met.
Executable command blocks
Most commands have small indents on the top side, which shows that they can be attached underneath other blocks.
These blocks cannot be used as a first block of a program.
Blocks that end the program
These blocks are not mandatory because your program can end on its own when all the blocks have been executed. These blocks do not have a bulge on the bottom, indicating that no more blocks can be placed after this block:
Courses and lessons with this Tutorial
This Tutorial is used in the following courses and lessons
Keep 'em clean - remote Scratch game course
"Keep 'em clean" is a game that uses the players' real-life movement captured by a camera to control many "people" and push them towards a sink where they wash their hands! In this course, you will learn the basics of programming with Scratch, as well as using the "Video Sensing" extension to receive movement from the camera!
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Lesson 1 - Creating a character
In this course, you will learn how to program the game "Keep 'em clean". This is a game where the player controls a number of "people" on the screen using movements detected by a camera.
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