TCL : Concatenate a variable and a string

Question

Assume we have a variable \'a\' set to 12345 :

set a 12345

Now how do i set a new variable \'b\' which contains the value of \'a\' and anot

Answer 1

From Tcl 8.6.2 onwards, there is string cat which can be used to solve this problem.

set b [string cat $a 9876]