LAPPEND(3TCL) - Linux man page online | Library functions

Append list elements onto a variable.

lappend(3tcl) Tcl Built-In Commands lappend(3tcl) _________________________________________________________________________________________________


lappend - Append list elements onto a variable


lappend varName ?value value value ...? _________________________________________________________________________________________________


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. Lap‐ pend 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.


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


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


append, element, list, variable
Tcl lappend(3tcl)
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lappend(3tcl) referred by append(3tcl) | dict(3tcl) | join(3tcl) | lindex(3tcl) | linsert(3tcl) | list(3tcl) | llength(3tcl) | lrange(3tcl) | lrepeat(3tcl) | lreplace(3tcl) | lsearch(3tcl) | lset(3tcl) | lsort(3tcl)
refer to lindex(3tcl) | linsert(3tcl) | list(3tcl) | llength(3tcl) | lrange(3tcl) | lset(3tcl) | lsort(3tcl)
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