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From: | Simon Albrecht |
Subject: | Re: Define variable only if it doesn't exist / is unbound |
Date: | Sat, 30 Mar 2019 19:05:44 +0100 |
On 29.03.19 12:11, David Kastrup wrote:
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?
The difference is that var = 0overwrites any previous binding, and I guess that’s what Pedro wanted to avoid. (?)
Best, Simon
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