Setting a string to a list value in TCL

Question

I have a list in TCL:

{word0} {word1} {word2} {word3}

I need to set a new string to one of the values in the list. What would the syntax be for that?

set test {$my_list 0}
set test [$my_list 0]

Neither work.

Sorry for the new question, but I'm not familiar with this syntax and not finding it in the docs.

What would you like as result? I'm not sure I understand your question otherwise. — Jerry
– Jerry, Commented Apr 18, 2014 at 20:21
The result should be word0. For $my_list 1 it would be word1 and so on. — some1
– some1, Commented Apr 18, 2014 at 20:25

Jerry · Accepted Answer · 2014-04-18 20:28:38Z

4

You can use lindex:

set my_list [list word0 word1 word2 word3]
set test [lindex $my_list 0]
puts $test
# => word0

In Tcl, the first element in a list has the index 0.

answered Apr 18, 2014 at 20:28

Jerry

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2 Comments

some1 Over a year ago

thanks, I'm used to lists being referenced by index implicitly.

Donal Fellows Over a year ago

@some1 The style you're talking about is more OO-like. Tcl's objects and classes tend to be heavier weight; they're not usually used for simple collection datatypes like lists or associative maps. (It would be possible to hack something in with unknown, but it would be a gross hack, slow and prone to not working as expected.)

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