lappend(n) Tcl Built-In Commands lappend(n)______________________________________________________________________________NAMElappend - Append list elements onto a variable
SYNOPSISlappend varName ?value value value ...?
_________________________________________________________________DESCRIPTION
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.
EXAMPLE
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
SEE ALSOlist(n), lindex(n), linsert(n), llength(n), lset(n), lsort(n),
lrange(n)KEYWORDS
append, element, list, variable
Tcllappend(n)
