Re: Optional arguments

[David Kastrup]

Paul Morris <address@hidden> writes:

> Hello all,
> I have a question about how to use optional arguments in scheme functions. 
> In my tiny example below I want to be able to leave out the 3rd argument,
> but then LilyPond takes the 2nd \makeScore as the 3rd argument (which
> doesn't work).  I'm just curious to learn how to do this assuming there is a
> way.  I can always just enter "" or \default for the 3rd argument (but then
> is it really optional?).

The last argument of a function is never "really" optional (the only way
to get the default value is by writing \default).

> Relevant docs:
> http://lilypond.org/doc/v2.19/Documentation/extending/scheme-function-definitions

The next one tells the story about optional arguments:
<URL:http://lilypond.org/doc/v2.19/Documentation/extending/scheme-function-usage>

-- 
David Kastrup