Re: Define variable only if it doesn't exist / is unbound

[Aaron Hill]

On 2019-03-28 2:18 pm, Valentin Villenave wrote:
> On 3/28/19, Pedro Pessoa <address@hidden> wrote:
> > I imagined something like:
> >
> > %%% pseudo
> > #(define var
> >     (not (is-bound? var) 0))
> > %%%
>
> I’d probably probably do something like
>
> (null? (ly:parser-lookup 'var))
>
> But I’m sure there are better ways :-)

;;;;
(if (not (defined? 'foo)) (define foo 47))
;;;;


-- Aaron Hill