what type of code does scratch demonstrate

Having the same script run in multiple instances on Scratch would require an even more hefty process, as neither variable or event-based switch logic could accomplish this with simplicity in Scratch. In conclusion, the event-based method is better for an interruption-allowing script, whereas the variable-based method is better for a script that needs to entirely execute on the variable-based virtual event. Once the script finishes, it will wait until the sprite is clicked again, even if the sprite was clicked while the script was running. The second example will not be interrupted, meaning that if the sprite is clicked while the script is being executed, the script will have to finish. Rather than the same script running two instances in parallel, the script will be interrupted and start from the beginning again.

Using the click event hat block (first example), suppose the sprite is clicked a second time while the script is still running. For example, in Scratch:Ĭan be replicated with the following code:īoth have almost exactly the same functionality, but there is one notable technical difference. A variable simply stores a value, and interchanging the value of the variable can be used to trigger various looping conditions and run a sequence of code. Not all programming languages are optimized for a plentiful amount of built-in events, and some cannot even multi-thread, so variables must be used in replacement of event. This event is the same as the mouse up/down/clicked event, but for the keyboard. Mouse clicked (down for less than 0.4 seconds).Wait (0) secs //frame pause so the condition is not checked in the same frame In Scratch, a simple script that checks if the mouse has been moved works as follows:

Movement over a particular object is often referred to as 'hover' and is commonly used in CSS.

The mouse does not necessarily need to move over a particular object. In other programming languages, this event triggers specific lines of code to execute when the mouse moves. These tutorials will give scripts for the main events:Ī mouse moved event is not pre-programmed in Scratch but can be easily replicated. There are the four built-in events in Scratch: A type of Hat Block, Event Blocks, create an event listener which will run the attached code upon the event triggering.

What type of code does scratch demonstrate