How to concisely concatenate strings in Tcl?

Question

I can easily concatenate two variables, foo and bar, as follows in Tcl: \"${foo}${bar}\".

However, if I don\'t want to put an intermediate result into a variable, how ca

Answer 1

You can embed commands within a double-quoted string without the need for a temporary variable:

set result "[myFoo $arg][myBar $arg]"

Answer 2

If you are doing this many times, in a loop, or separated by some intermediate code, you might also consider:

set result ""
append result [myFoo $arg]
append result [myBar $arg]
append result [myBaz $arg]

Answer 3

just write it as a word with no extra spaces:

[myFoo $arg][myBar $arg]

Tcl sees this as a single word after substitution, regardless of the result of the two subcommands.