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arfer
Master
Joined: 26 Nov 2004
Posts: 436
Location: Manchester, UK
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 Posted: Mon Nov 09, 2009 9:12 am Post subject: Manipulating multiple variables simultaneously |
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I want to trim multiple variables in a single line of code. For example, trimming the caret symbol (^) from the start and end of the variables a, b, c, d, e, f as below :-
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foreach var {a b c d e f} {set $var [string trim $$var ^]}
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The second $ in $$var doesn't get substituted. It behaves as if I had used ${$var}. Is there any 'neat/clever' way to do this without resorting to the following code :-
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foreach var {a b c d e f} {set $var [string trim $[subst -nocommands -nobackslashes $var] ^]}
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The problem being any dollar symbol in any one of more of the variable values will probably break the code.
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user
Joined: 18 Mar 2003
Posts: 1452
Location: Norway
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| Posted: Mon Nov 09, 2009 9:59 am Post subject: use set |
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| Code: | | set $var [string trim [set $var] ^] |
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arfer
Master
Joined: 26 Nov 2004
Posts: 436
Location: Manchester, UK
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| Posted: Mon Nov 09, 2009 10:28 am Post subject: |
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Thanks!
Though I feel a bit of a fool not managing to work that one out myself.
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nml375
Revered One
Joined: 04 Aug 2006
Posts: 2857
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| Posted: Mon Nov 09, 2009 12:42 pm Post subject: |
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I suppose you could use upvar for this, but otherwize user's suggestion should do just well...
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