CODEWITHSUNDEEP
tcl
vho
vho

Reputation: 1141

tcl read variables with the same prefix

I have a variables with the same prefix. For example:

set prefix1Postfix 89
set prefix2Postfix 56 
set prefix3Postfix 56

So is it possible iterate over them by this way: 

set l [list prefix1 prefix2 prefix3]

foreach item $l {
     puts "item = ${{$l}Postfix}"
}

Upvotes: 1

Views: 318

Answers (2)

glenn jackman
glenn jackman

Reputation: 247192

In this scenario, the general advice is that it's easier to use arrays

set prefixPostfix(1) 89
set prefixPostfix(2) 56 
set prefixPostfix(3) 56

foreach key [array names prefixPostfix] {
    do something with $prefixPostfix($key)
}

Upvotes: 3

Jerry
Jerry

Reputation: 71598

No, Tcl is interpreting the {$l part as a variable following the first opening and closing brace it encounters:

puts "item = ${{$l}Postfix}"
              ^---^

And the variable should have been $item as well ;) The braces also prevent substitution, so that Tcl will look for literal $item if you use braces.

One workaround you can use is to assign a variable to the suffix:

set prefix1Postfix 89
set prefix2Postfix 56 
set prefix3Postfix 56

set l [list prefix1 prefix2 prefix3]
set p "Postfix"

foreach item $l {
     puts "item = [set $item$p]"
}

Upvotes: 3

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