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Re: How to see if variable is defined? [message #3497 is a reply to message #3411]

Fri, 27 January 1995 06:49

thompson
Messages: 584
Registered: August 1991

Senior Member

nmw@ion.le.ac.uk (Nigel Wade) writes:

> In article 95Jan20094331@venice.water.ca.gov, rfinch@water.ca.gov (Ralph Finch) writes:
>> Is there a nice way of checking if a variable is defined?
>>
>> I have a widget_control command which removes a menu, and I need to
>> see if the menu is defined before destroying it.
>> --
>> Ralph Finch 916-653-8268:voice 916-653-6077:fax
>> rfinch@dop.water.ca.gov / finger for PGP public key
>> "Nada burra la chamaca." A.G.
>> Any opinions expressed are my own; they do not represent my employer

> There are two possible ways of doing this.

> The first is to use the keyword_set function. This returns 1 if a variable
> is defined, 0 otherwise. ...

Not quite true. KEYWORD_SET returns 1 if a variable is defined AND IS NOT
ZERO!

Bill Thompson

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[Message index]

		How to see if variable is defined? By: rfinch on Fri, 20 January 1995 09:43
		Re: How to see if variable is defined? By: zawodny on Thu, 26 January 1995 12:28
		Re: How to see if variable is defined? By: nmw on Thu, 26 January 1995 03:18
		Re: How to see if variable is defined? By: thompson on Fri, 27 January 1995 06:49
		Re: How to see if variable is defined? By: rep2857 on Tue, 24 January 1995 08:22
		Re: How to see if variable is defined? By: ps on Thu, 26 January 1995 09:47
		Re: How to see if variable is defined? By: thompson on Mon, 23 January 1995 07:47

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