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Re: Optional parameters [message #38189 is a reply to message #38182]

Tue, 24 February 2004 14:03

JD Smith
Messages: 850
Registered: December 1999

Senior Member

On Tue, 24 Feb 2004 14:45:09 -0700, Pavel Romashkin wrote:

> And what exactly would be the purpose of such sequence of calls, other
> than actually trying to *define* foo in the first function call? If I
> didn't need foo re-defined, I'd not even mention it on the first line.
> So this *is* the case for 3 copy-paste calls, I guess :-)
> I never tried to use keywords for this sort of creative purposes. If I
> have a large dataset I don't want to re-compute, I keep it in a pointer
> (or object, allrigh, David? :-) and I try to always know when it gets
> passed into a function to avoid redefinition and other mishaps.
> After all, how is this behavior different than simply
>
> foo = 100 ; foo is now defined, too...

It's different because I'm overloading a keyword to do two things: 1)
take as input a value for foo to override any internal value, and 2)
return the value of foo used (default or otherwise). Admittedly, this
is bad form, but it's actually very convenient when you want to bring
some variable out "over the head" of your function calls, but still
need to be able to set the variable via a parameter. This is
typically for interactive usage, not for real production code, but the
problem still exists.

JD

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[Message index]

		Re: Optional parameters By: Pavel Romashkin on Wed, 25 February 2004 10:21
		Re: Optional parameters By: David Fanning on Wed, 25 February 2004 09:26
		Re: Optional parameters By: Craig Markwardt on Wed, 25 February 2004 08:48
		Re: Optional parameters By: David Fanning on Wed, 25 February 2004 07:08
		Re: Optional parameters By: Paul Van Delst[1] on Wed, 25 February 2004 06:49
		Re: Optional parameters By: Craig Markwardt on Tue, 24 February 2004 21:50
		Re: Optional parameters By: JD Smith on Tue, 24 February 2004 14:03
		Re: Optional parameters By: R.G. Stockwell on Tue, 24 February 2004 14:02
		Re: Optional parameters By: Pavel Romashkin on Tue, 24 February 2004 13:45
		Re: Optional parameters By: JD Smith on Tue, 24 February 2004 12:13
		Re: Optional parameters By: Pavel Romashkin on Tue, 24 February 2004 09:59
		Re: Optional parameters By: David Fanning on Tue, 24 February 2004 09:08
		Re: Optional parameters By: David Fanning on Tue, 24 February 2004 08:31
		Re: Optional parameters By: JD Smith on Tue, 24 February 2004 08:10
		Re: Optional parameters By: David Fanning on Mon, 23 February 2004 17:39
		Re: Optional parameters By: David Fanning on Mon, 23 February 2004 17:05

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