DIM in a program

[Angus]

Maybe that is another capitalized non-capitalzed matter?

In fact I expected the length to be a number and not a list containing the length. I found that I got a list.... But I did use DIM in the program.
A few seconds ago I tried both dim() and DIM() in the cas.

vec:=[1,2,3,4,5];

invocing dim(vec) in the cas turns to DIM(vec) in the history und results in 5.
invocing DIM(vec) in the cas gives {5}.

That is strange

P.S. The original question on splitting up a command to part1*part2 remains, though. For a student learning to program that can really become a problem don't you think?