lappend - Append list elements onto a variable
lappend varName ?
value value value ...?
This command treats the variable given by
varName as a list and appends
each of the
value arguments to that list as a separate element, with
spaces between elements. If
varName does not exist, it is created as a
list with elements given by the
value arguments.
Lappend is
similar to
append except that the
values are appended as list
elements rather than raw text. This command provides a relatively efficient
way to build up large lists. For example, “
lappend a $b”
is much more efficient than “
set a [concat $a [list
$b]]” when
$a is long.
Using
lappend to build up a list of numbers.
% set var 1
1
% lappend var 2
1 2
% lappend var 3 4 5
1 2 3 4 5
list(3tcl),
lindex(3tcl),
linsert(3tcl),
llength(3tcl),
lset(3tcl),
lsort(3tcl),
lrange(3tcl)
append, element, list, variable