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

[David Kastrup]

Pedro Pessoa <address@hidden> writes:

> Hello,
> I want to init a variable only if it isn't bound. This seems a simple
> matter, I was surpised I couldn't do it.
> The thing is that it throws an 'unbound variable error' with anything I try.
> I imagined something like:
>
> %%% pseudo
> #(define var
>     (not (is-bound? var) 0))
> %%%

var = 0

Does it need to be in Scheme?

-- 
David Kastrup