Block Shapes

Scratch programming blocks are designed in different shapes, which can be connected to each other vertically like a jigsaw puzzle. Scripts are created by series of connected blocks. Each data type has its own shape and a specially shaped slot. There are five shapes of blocks:

  • Hat blocks
  • Stack blocks
  • Reporter blocks
  • Boolean blocks
  • Cap blocks

1.Hat blocks

A hat block is used to start the script, and is always placed on the top of other blocks. The following is the general shape of a Hat Block.

Each hat block uses its own way to activate a script, and therefore different scripts can be executed at different time points.

2. Stack blocks

A stack block is a rectangular block that can fit above or below other blocks, with a notch at the top and a bump on the bottom. A typical Stack Block looks like this:

Stack blocks are used to execute the main commands, and therefore are the majority among all the blocks.

3. Reporter blocks

Each reporter block contains a value that can be a numerical value or character string. The following is the general shape of a Reporter Block.

A reporter block can be used in any script that requires data but cannot be used independently. A reporter block can be fit into another block as long as the slots fit.

4. Boolean Blocks

A boolean block contains a condition, which can be either "true" or "false". A typical boolean Block is an elongated hexagon as shown in the following:

A boolean block must be put into the hexagonal slot of another block, and therefore cannot be used independently.

5. Cap blocks

A cap block ends a script or project. It can be put only under all blocks. The following is the general shape of a cap block.

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