lappend

Section: Tcl Built-In Commands (n)
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NAME

lappend - Append list elements onto a variable  

SYNOPSIS

lappend 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 ALSO

list(n), lindex(n), linsert(n), llength(n), lset(n), lsort(n), lrange(n)  

KEYWORDS

append, element, list, variable


 

Index

NAME
SYNOPSIS
DESCRIPTION
EXAMPLE
SEE ALSO
KEYWORDS
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