In this screencast, you’ll get familiar with Scratch and create your own program wheresomething surprising happens. You’re looking at the Scratch project editor.
Scratch is just a programming language. Programming languages allow computer scientists to givecomputers instructions. In this project editor, there is a spriteon a blank stage. “Sprite” is another word for a characteror object. In Scratch, you will program spites to do different things.
In the middle of the screen, you’ll see a scripts menu. In this menu, you will findthe instruction blocks you’ll use to create programs.
These blocks are sorted by color-coded categories, like “motion” and “looks.”
One of the best ways to learn computer science is to explore and try new things. While you’reworking in Scratch, if you see a block that looks interesting, click it to find out whatit does! To select a block to use in your program,click and drag it into the scripts area. Many blocks have values that you can changeby clicking on the value and typing. To add another instruction to your program,select a block and drag it until it snaps into the first instruction block.
The computer will “read” the instructions you create to make your game do what you wantit to do. When a computer scientist tells a computer to read and carry out instructions,it is called “running” the code. These blocks run in the order they are stacked.
To run a stack of blocks, just click on it. Cool! This sprite plays a note and moves tothe right a little. As you explore, if you find a block that doesn’tappear to do anything when clicked, click the “block help” icon, then the block.
Doing this gives you a definition. For example, this block repeats something a specified numberof times, then shows an example of how it’s used.
This block appears to go around other blocks, so lets check it out!
Cool! Now the sprite plays the sound and moves forward 3 times.
Now that you’ve seen a brief introduction on how to use Scratch, it’s your turn toexplore. Your task is to “program something surprising.”
Remember to try out different blocks, and use the “block help” tool if you wantmore information on a block. Click on the Scratch project tab you openedpreviously, and try out different blocks-- explore what you’re able to do in Scratch.
If you have a question while working, remember to ask a neighboror put your sticky on your computer monitor to get the attentionof the CS First Guru.