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- "Custom Block" redirects here. For the block itself, see () (Custom block).
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define custom block
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Scratch 3.0 has the following 1 Stack block in More Blocks:
Uses of Custom Blocks
Custom blocks are useful in many programming situations, such as the following:
- reducing project file size
- running a script without screen refresh
- organization of scripts instead of duplicating large scripts with minor edits
Custom blocks allow for number, string, and Boolean inputs to be inserted into the definition and title, which the input of can be edited in the stack block. For example, if you have a number input inserted into a custom block's definition, you can run the custom procedure entering any number into the custom stack block, and that number will be rendered as all the number inputs in the definition. This easy input insertion method allows a project to perform large, customizable scripts without having to duplicate the scripts, edit a few blocks, and waste file space.
Using custom blocks is the only way to run scripts without screen refresh. Screen refresh is the very miniscule wait between each block in a script. When creating the title of a custom block, there are buttons to add inputs and a checkbox that allows you to disable screen refresh (by default it is enabled.) When the box is checked and the custom block runs, it will perform in an instant, which can be beneficial for setting up a particular scene in a project or performing large mathematical calculations, possibly in a game with artificial intelligence.
- Main article: List of Block Workarounds
The workaround for custom blocks does not allow features such as inputs, for they would require variables, or disabling screen refresh, but it works well for basic scripts. It uses a broadcasting method instead of a procedure. When the broadcast is received, in a way the sprite or stage performs its own procedure.
when gf clicked broadcast [jump v] and wait
when I receive [jump v] repeat (5) change y by (6) end repeat (5) change y by (-6) end
Procedures in Snap!
Snap!, previously called BYOB, is a graphical programming language based on Scratch. Among other things (the most important of which are first class procedures and first class lists) Snap! allows making reporters and predicates as well as stack blocks.
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Many Scratchers would like the ability to make custom reporter and Boolean blocks. Additionally, dropdown inputs as arguments have also been requested, to the extent that some people used JSON hacking to insert them into custom blocks (this does not work in Scratch 3.0.)
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