The document seems to be invalid

In the workbench example
42.between(-3, 100)

I tested the code, but the following error occurred.

ERROR: The method ‘between()’ does not exist for an instance of the class ‘Integer’.
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
42.between(-3, 100)

------^ <<<< Line: 1, columns: 4-11

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Script code index: [3-10]

I am just on my phone, though doesn’t that routine have a question mark in it? In Sk the question mark is part of the name. Most routines that have a Boolean result have a question mark in their name.
42.between?(-3, 100)

2.2 Simple routine calls

42.negate()          // returns -42
42.negate            // brackets optional if no arguments
42.between(-3, 100)  // true - call with arguments
42.between(-3 100)   // comma between arguments optional

It might be a typo on the web. You can double check in the SkookumIDE which will have the latest. I can double check when I am next back at my computer…

:sk: IDE
in Tutorial Workbench

//-----------------------------------------
// Simple routine calls
// Read more - https://skookumscript.com/docs/v3.0/#calling-routines-and-passing-arguments
42.negate()          // returns -42
42.negate            // brackets optional if no arguments
42.between(-3, 100)  // true - call with arguments
42.between(-3 100)   // comma between arguments optional

Note that
I got Unreal 4.24.3 for the first time today and
SK plug-ins were also received today.

Did 42.negate work?
If it does then there is a typo either in the examples/tutorials/web or something more interesting.

42.negate

This works fine.

Just checked. It is a typo in the examples. It should have the question mark that I mentioned - so:

42.between?(-3, 100)

OK Thank you for quick reply.
I’m going to continue reading the documentation and test it out one by one.