string TCL 字符串连接
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TCL string concat
提问by Narek
What is the recommended way of concatenation of strings?
推荐的字符串连接方式是什么？
回答by Donal Fellows
Tcl does concatenation of strings as a fundamental operation; there's not really even syntax for it because you just write the strings next to each other (or the variable substitutions that produce them).
Tcl 将字符串连接作为基本操作；它甚至没有真正的语法，因为您只是将字符串彼此相邻编写（或生成它们的变量替换）。
set combined $a$b
If you're doing concatenation of a variable's contents with a literal string, it can be helpful to put braces around the variable name or the whole thing in double quotes. Or both:
如果您正在将变量的内容与文字字符串连接起来，则将大括号括在变量名称或整个内容中可能会有所帮助。或两者：
set combined "$a${b}c d"
Finally, if you're adding a string onto the end of a variable, use the appendcommand; it's faster because it uses an intelligent memory management pattern behind the scenes.
最后，如果您要在变量末尾添加字符串，请使用以下append命令；它更快，因为它在幕后使用了智能内存管理模式。
append combined $e $f $g
# Which is the same as this:
set combined "$combined$e$f$g"
回答by LaC
If they are contained in variables, you can simply write "$a$b".
如果它们包含在变量中，您可以简单地编写"$a$b".
