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lappend(n)                                  Tcl Built-In Commands                                 lappend(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  rela-tively relatively
       tively  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



Tcl                                                                                               lappend(n)