In GEL if you want to type more than one command you have to use
the ; operator, which is a way to separate expressions,
such a combined expression will return whatever is the result of the last
one, so suppose you type the following:
This expression will yield 5.
This will require some parenthesizing to make it unambiguous sometimes,
especially if the ; is not the top most primitive. This slightly differs from
other programming languages where the ; is a terminator of statements, whereas
in GEL it’s actually a binary operator. If you are familiar with pascal
this should be second nature. However genius can let you pretend it is a
terminator somewhat, if a ; is found at the end of a parenthesis or a block,
genius will itself append a null node to it as if you would have written
;null.
This is useful in case you do not want to return a value from say a loop,
or if you handle the return differently. Note that it will slightly slow down
the code if it is executed too often as there is one more operator involved.