string 如何在 Tcl 中简洁地连接字符串？
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How to concisely concatenate strings in Tcl?
提问by WilliamKF
I can easily concatenate two variables, foo and bar, as follows in Tcl: "${foo}${bar}".
我可以很容易地连接两个变量，foo 和 bar，在 Tcl 中如下所示：“${foo}${bar}”。
However, if I don't want to put an intermediate result into a variable, how can I easily concatenate the results of calling some proc?
但是，如果我不想将中间结果放入变量中，如何轻松连接调用某些 proc 的结果？
Long hand this would be written:
长手这将被写成：
set foo [myFoo $arg]
set bar [myBar $arg]
set result "${foo}${bar}"
Is there some way to create result without introducing the temporary variables foo and bar?
有没有办法在不引入临时变量 foo 和 bar 的情况下创建结果？
Doing this is incorrect for my purposes:
这样做对我的目的是不正确的：
concat [myFoo $arg] [myBar $arg]
as it introduces a space between the two results (for list purposes) if one does not exist.
因为如果一个结果不存在，它会在两个结果之间引入一个空格（用于列表目的）。
Seems like 'string concat' would be what I want, but it does not appear to be in my version of Tcl interpreter.
似乎“字符串连接”将是我想要的，但它似乎不在我的 Tcl 解释器版本中。
string concat [myFoo $arg] [myBar $arg]
String concat is written about here:
字符串 concat 写在这里：
回答by Bryan Oakley
You can embed commands within a double-quoted string without the need for a temporary variable:
您可以在双引号字符串中嵌入命令而无需临时变量：
set result "[myFoo $arg][myBar $arg]"
回答by ramanman
If you are doing this many times, in a loop, or separated by some intermediate code, you might also consider:
如果您多次这样做，在一个循环中，或由一些中间代码分隔，您还可以考虑：
set result ""
append result [myFoo $arg]
append result [myBar $arg]
append result [myBaz $arg]
回答by SingleNegationElimination
just write it as a word with no extra spaces:
把它写成一个没有多余空格的单词：
[myFoo $arg][myBar $arg]
Tcl sees this as a single word after substitution, regardless of the result of the two subcommands.
Tcl 将其视为替换后的单个单词，而不管这两个子命令的结果如何。
