how to convert a list into string in tcl

Question

How do I convert a list into string in Tcl?

Answer 1

most likely what you want is join however depending on what you are trying to do this may not be necessary.

anything in TCL is able to be treated as a string at anytime, consequently you may be able to just use your list as a string without explict conversion

Answer 2

If you just want the contents, you can puts $listvar and it will write out the contents as a string.

You can flatten the list by one level or insert a separator character by using join, as jk answered above.

Example:

% set a { 1 2 3 4 { 5 6 { 7 8 9 } } 10 }
 1 2 3 4 { 5 6 { 7 8 9 } } 10 
% puts $a
 1 2 3 4 { 5 6 { 7 8 9 } } 10 
% join $a ","
1,2,3,4, 5 6 { 7 8 9 } ,10
% join $a
1 2 3 4  5 6 { 7 8 9 }  10

Answer 3

set list {a b c d e f}
for {set i 0} {$i<[llength $list]} {incr i} {
    append string [lindex $list $i]
}
puts $string

Answer 4

To flatten a list using classes:

set list { 1 2 3 4 { 5 6 { 7 8 9 } } 10 }

package require struct::list
struct::list flatten -full $list