Control Structures
Conditionals
The if Command
- Implicit invocation of
expr
- Optional keywords (
then, else)
elseif capability
The switch Command
- Supports all pattern matching
options (
-exact, -glob, and
-regexp)
-- is crucial
Iteration
The while Command
- Implicit invocation of
expr
break
continue
The for Command
- Modelled after C's
for loop
- Implicit invocation of
expr
break
continue
The foreach Command
Iteration over lists. More efficient than indexing over a list (is
able to make one pass over the list).
The loop Command
Extended Tcl.
- A simpler (more constrained) iterator than
for
break
continue