Function within List.Generate

You have it correct.

The each keyword is a syntax sugar, which is a shorthand form of "(_) =>". In the first case, only the each keyword is used. The program will find whether there is a Unit column in the variable (identifier) ​​named "_" in the nearest layer.

The key point is:

• The function in the first parameter has no parameters, so the Unit column can be found (there is no variable named _ at the current level, so it will be looked for outside).
• The next three parameters all use the each keyword, which uses _ as the name, so [Unit] in them cannot find the Unit column (looking for the nearest variable named _).