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lappend.n
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1994-09-20
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lappend(n) Tcl Built-In Commands
_________________________________________________________________
NAME
lappend - Append list elements onto a variable
SYNOPSIS
lappend _v_a_r_N_a_m_e _v_a_l_u_e ?_v_a_l_u_e _v_a_l_u_e ...?
_________________________________________________________________
DESCRIPTION
This command treats the variable given by _v_a_r_N_a_m_e as a list
and appends each of the _v_a_l_u_e arguments to that list as a
separate element, with spaces between elements. If _v_a_r_N_a_m_e
doesn't exist, it is created as a list with elements given
by the _v_a_l_u_e arguments. Lappend is similar to append except
that the _v_a_l_u_es 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.
KEYWORDS
append, element, list, variable
Tcl 1