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Block-based Programming in Scratch

Blocks

Computer programs are sets of commands, which we use to explain to the computer how to complete a certain task or solve a problem. Given that most programming languages ​​are textual, developers often type commands.

In the visual programming language Scratch, we don’t write commands, but instead we use blocks, which represent them. We create programs by arranging (stacking) blocks in the appropriate order.

Types of Blocks in Scratch

There are 4 types of blocks in Scratch:

_images/4Bloka.png
  1. Command blocks;

  2. Blocks which link events with the running of the program;

  3. Blocks which control the running of the program;

  4. Blocks which report a certain value (function blocks).

Command Blocks

Command blocks have notches at the top and bumps on the bottom. They are designed in a way that allows them to be connected (stacked) to other blocks. We can just drag a block from the appropriate category into the scripts area (space for programming) and connect it to other blocks, which are already there. Connecting blocks looks like magnetic attraction - as soon as we place a notch of one block close to the bump of another, it will “stick” to it, thus continuing the sequence. The bumps allow new blocks to be added.

Blocks which control the running of the program

Similar to command blocks, the blocks controlling the running of the program have notches at the top and bumps on the bottom. We can put them above other blocks, as well as put other blocks below them.

These blocks are also characterized by the ability to accommodate other blocks (other blocks can be put inside them). For example, the script R10M10 allows our sprite to move 10 steps 10 times.

Blocks which report a certain value (function blocks)

Apart from their shape, these blocks are different from other blocks because they cannot be part of the script on their own. In other words, they are not added to other blocks, but they form an integral part of the block they are inserted to.

Function blocks contain a certain value. Their appearance depends on the type of information they contain:

  • the blocks with rounded edges contain numbers XP or strings Costume;

  • angular blocks contain values True or False Touch.

Command blocks and blocks that control the running of the program have input fields into which function blocks can be inserted. These input fields can have a rounded or hexagonal shape.

Vazno In blocks which have rounded input fields SayE, we can insert both rounded and hexagonal function blocks Say, while blocks with a hexagonal input field WUE, can only receive hexagonal function blocks WU.

Next to function blocks, in categories where they are located, there are boxes that you can check. When you check these boxes, the value stored in these blocks will become visible on the stage.

_images/Touch.png

The value stored in a function block can also be seen by clicking on the block itself. For example, the block Touching stores the value false because our sprite is not touching the displayed color, while the block Sabiranje stores the value 22, because that is the sum of the numbers we see in the block).

    Q-1: Analyze the script presented in the figure. Choose the result of the running of the program.
    _images/6050.png
  • When we click on the green flag, the sprite will say "true".
  • You are absolutely right!
  • When we click on the green flag, the sprite will say "false".
  • The angular function block returns the values True or False. Since the statement is 60>50 true, the sprite will say "true".