Re: How to "interpolate a string"

From: Bryan Oakley (oakley_at_bardo.clearlight.com)
Date: 10/05/04 

Date: Tue, 05 Oct 2004 17:31:03 GMT

Sektor van Skijlen wrote:
> Sorry, maybe it's simple, but nothing comes to my mind :)
>
> Say, we have something like that
>
> set one 1
> set two 2
> set three 3
>
> set x {$one $two $three}
>
> and x contains $one $two $three
>
> how to make "1 2 3" using only the current value of x, in other words,
> to force appropriate substitutions on this expression?
>
>

The correct technique depends on whether you intend to create a list or
a string. To create a proper list no matter what the contents of one,
two and three, do:

     set x [list $one $two $three]

To create a string you can do this:

     set x "$one $two $three"

For a small subset of all possible values of one, two and three, the two
approaches will produce seemingly identical results. For many real-world
values the two will give different but equally useful results (equally
useful in different contexts, that is).

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