Version 8 of In

Updated 2007-04-26 12:08:10 by lvirden

From 8.5, expr operator for list inclusion test.

 if {$el in $list} ...

is equivalent to, but much nicer than

 if {[lsearch -exact $list $el] >= 0} ...

The negation ("not in") is ni. So 8.5 Tcl really makes us knights who say 'ni'... For users of earlier versions, the following little helper comes in handy:

 proc in {list el} {expr [lsearch -exact $list $el] >= 0}}
 ...
 if [in $list $el] ...

- rs 2007-04-26


Category Command , well sub-command, as part of expr