How to create an array of lists in Tcl?

Question

I need to store number of lists in array.

I have a command which returns a list:Suppose it is CommandReturninglist

set aa [ CommandReturninglist{0} ]

Clarification: CommandReturninglist is taking input argument 0.

I need to use it ten times and store the lists returned in array.

for {set i 0 } { $i < 10 } { incr i } {
set d($i) [ CommandReturninglist{$i} ]
puts $d($i)
}

I cant store the list as shown in above case. Here $i in CommandReturninglist{$i} is the needed argument.

Please suggest some way.

I don't quite understand how CommandReturninglist is defined if you're able to call it like that. Could you clarify? Maybe post the proc definition? And also the desired results? — Jerry
– Jerry, Commented Jun 18, 2020 at 14:38

Donal Fellows · Accepted Answer · 2020-06-18 14:24:19Z

1

You're very close. You just need to put a space between the command name and its argument, and make sure not to put the argument in braces if you want it substituted.

for {set i 0 } { $i < 10 } { incr i } {
    set d($i) [CommandReturninglist $i]
    puts $d($i)
}

It's also possible for commands to (effectively) take variables by reference that they can work with (a way to move whole arrays across procedure boundaries) or to pass around lists of lists (or dictionaries of lists, or…) and use those.

answered Jun 18, 2020 at 14:24

Donal Fellows

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2 Comments

Donal Fellows Over a year ago

@ManishaKuhar I'm passing $i as an argument. Arguments are separated from command names by spaces in Tcl.

Manisha Kuhar Over a year ago

I got it now, Thanks

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