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lappend.3tcl

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NAME

lappend - Append list elements onto a variable

SYNOPSIS

lappend varName ?value value value ...?

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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 ALSO

list(3tcl), lindex(3tcl), linsert(3tcl), llength(3tcl), lset(3tcl), lsort(3tcl), lrange(3tcl)

KEYWORDS

append, element, list, variable