Question

I have a question regarding to the following lines:

set list1 "1 2 3 4 5 6" ##line 1
set list2 {1 2 3 4 5 6} ##line 2

are these two lines both declare a list?
what is the difference between them?

Answer 1

In your specific example, there is no difference.

Neither really declare a list, as you cannot really declare a list in Tcl. But both set your variables to a valid list representation.

The difference only is visible if your items are special to the parser in any way, when “” allows replacements, while {} keeps the content unreplaced.

A third alternative woulde be:

 set list3 [list 1 2 3 4 5 6]