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ActiveTcl User Guide |
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append - Append to variable
append varName ?value value value ...?
Append all of the value arguments to the current value of
variable varName. If varName doesn't exist, it is
given a value equal to the concatenation of all the value
arguments. The result of this command is the new value stored in
variable varName. This command provides an efficient way to
build up long variables incrementally. For example, ``append a
$b'' is much more efficient than ``set a $a$b'' if
$a is long.
Building a string of comma-separated numbers piecemeal using a
loop.
set var 0
for {set i 1} {$i<=10} {incr i} {
append var "," $i
}
puts $var
# Prints 0,1,2,3,4,5,6,7,8,9,10
concat, lappend
append, variable
Copyright © 1993 The Regents of the University of California.
Copyright © 1994-1996 Sun Microsystems, Inc.
Copyright © 1995-1997 Roger E. Critchlow Jr.