Tcl [list abc] vs {abc} is there a difference and in what context?

Question

I play with Tcl and found several scenarios where it [list a b c]is interchangeable with {a b c}. What is the preferred method and where [list a b c]does it not match the behavior {a b c}?

Answer 1

% set lista [list a b c]
a b c
% set listb {a b c}
a b c
% set b {1 2 3}
1 2 3
% set lista [list a $b c]
a {1 2 3} c
% set listb {a $b c}
a $b c

When you build a list using literals, these two forms are equivalent. When you use variables, the form [list ...]will expand the variable before placing it on the string, and the form {...}will not.

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Answer 2

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