Question

I need some help with my foreach loop logic:

I need to put a comma after each print statement except for the last statement in the loop

ex: blah,blah2,blahlast

The following code puts comma even after the last statement.

 foreach row $regions {
            set name [lindex $row 0]
            set id [lindex $row 1]
            puts "{'name':'$name', 'val':'$region_id'}"
            puts ","

        }

Maybe if i count the number of times its going to loop, I can probably check for an if condition to put comma unlti its the last iteration

Answer 1

The trick is to print the comma on all the iterations but the first one (that is, to reverse your logic):

set xs {a b c}
set s ""
set need_comma false
foreach x $xs {
  if {$need_comma} {
    append s ,
  } else {
    set need_comma true
  }
  append s $x
}
puts $s

would produce

a,b,c

Note that it seems you’re merely looking for the join command.