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Man Pages


Manual Reference Pages  -  LAPPEND (n)

NAME

lappend - Append list elements onto a variable

CONTENTS

Synopsis
Description
Example
Keywords

SYNOPSIS

lappend varName ?value value value ...?

   








\L’|0u-1v’\l’75u+3n_’\L’0u+1v-0u’\l’|0u-1.5n_’



\L’|0u-1v’\L’0u+1v-0u’\l’|0u-1.5n_’





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
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Tcl LAPPEND (n)

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