Question

proc test {a b c } {
       puts $a
       puts $b
       puts $c
}
set test_dict [dict create a 2 b 3 c 4 d 5]

Now I want to pass dict into test like this:

test $test_dict

How to make test only selects three elements in the dict with the same name of its parameters (the keys). The expected output should be:

2
3
4

Because it selects a b c in the dictionary but not d. How can I do this? I saw some code does like this but I can’t make it work.

Answer 1

I think you should use dict get:

proc test {test_dic} {
  puts [dict get $test_dic a]
  puts [dict get $test_dic b]
  puts [dict get $test_dic c]
}

set test_dict [dict create a 2 b 3 c 4 d 5]
test $test_dict

Edit:
Another variant would be to use dict with:

proc test {test_dic} {
  dict with test_dic {
    puts $a
    puts $b
    puts $c
  }
}

set test_dict [dict create a 2 b 3 c 4 d 5]
test $test_dict

But test gets still a list.