20 blocks 1 | Mediateca de EducaMadrid

Have you seen the My Blocks category in the Scratch Blocks palette? 00:00:00

When you click on it, no blocks are present until you create one. 00:00:13

Let's explore how to create a customized block, and when and why you might want to use them. 00:00:17

Let's say you are creating a Scratch program, and you've written a sequence of steps that performs a particular action. 00:00:22

That action could be performing a complicated spin move, playing a set of musical notes, 00:00:28

drawing a shape with the pen tool, performing some complex math, or anything 00:00:33

else. That stack of blocks is known as a procedure or a routine. Most computer 00:00:38

programming languages allow you to create a special name for a group of 00:00:44

commands or lines of code and then call for that sequence to run at any point in 00:00:47

the main program. In Scratch, we use my blocks. Click on my blocks in the blocks 00:00:52

palette and then click on make a block. You can give your block any name you 00:00:58

want, but I'd recommend something descriptive, so you can recall later what this stack of 00:01:02

blocks does. 00:01:06

Let's say I want to create a series of blocks that makes my cat sprite spin forward and 00:01:07

backward. 00:01:12

I'll call my block Cat Spin. 00:01:13

Once I click OK, you'll see a new Event Handler block appears on the Scripts area 00:01:15

that says Define. 00:01:20

Under this block, I want to add all the code blocks in my procedure. 00:01:22

For this example, I've added some repeating code that makes the cat whirl and turn forward 00:01:27

in two complete circles, and then reverse the world, turning in the opposite direction. 00:01:32

Let's click on this stack and see how it looks. 00:01:37

Now that I have defined what my custom block does, let's use it in my main program. 00:01:41

When I want the spin to occur, I'll grab my custom cat spin block, 00:01:46

now available in the Blocks palette, and place it in my main program. 00:01:50

In this program that I'm writing, the cat will spin after each background change, 00:01:54

and say something after the spin. 00:01:58

Let's see how this looks by clicking the green flag. 00:02:00

The advantage of writing this procedure separately is that I can use one block to call for a 00:02:09

whole set of steps to be run each time I need it. 00:02:14

Creating separate procedures using custom blocks makes the code faster to write and 00:02:18

read, and easier or quicker to edit. 00:02:22

If I wasn't using a custom block, this is how the code would look, looking at them side 00:02:25

by side, which is easier to read. 00:02:29

And look, if I wanted to change the spin, I only have to edit it in one place, versus 00:02:36

editing it in multiple places in my long, single code sequence. 00:02:41

You don't have to use a custom block just for code that will repeat. 00:02:46

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