Description: Append list elements onto a variable
Syntax: lappend varName ?value value value ...?
Argument: variable name, a list of values
Returns: text string with a list of values, with spaces between elements
See Also: foreach, append, concat, list, llength, lindex
Examples:
set x {}
foreach {i j} {a b c d e f} {
lappend x $j $i
}
SETVAL text1=$x
# The value of x and tag text1 is "b a d c f e"
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 doesn’t 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]]’’
if $a contains a long list.