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lassign(n)                                  Tcl Built-In Commands                                 lassign(n)



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NAME
       lassign - Assign list elements to variables

SYNOPSIS
       lassign list varName ?varName ...?
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DESCRIPTION
       This  command  treats  the value list as a list and assigns successive elements from that list to the
       variables given by the varName arguments in order.  If there are more variable names than  list  ele-ments, elements,
       ments,  the  remaining  variables  are set to the empty string.  If there are more list elements than
       variables, a list of unassigned elements is returned.

EXAMPLES
       An illustration of how multiple assignment works, and what happens when there are either too  few  or
       too many elements.
              lassign {a b c} x y z       ;# Empty return
              puts $x                     ;# Prints "a"
              puts $y                     ;# Prints "b"
              puts $z                     ;# Prints "c"

              lassign {d e} x y z         ;# Empty return
              puts $x                     ;# Prints "d"
              puts $y                     ;# Prints "e"
              puts $z                     ;# Prints ""

              lassign {f g h i} x y       ;# Returns "h i"
              puts $x                     ;# Prints "f"
              puts $y                     ;# Prints "g"
       The  lassign command has other uses.  It can be used to create the analogue of the "shift" command in
       many shell languages like this:
              set ::argv [lassign $::argv argumentToReadOff]

SEE ALSO
       lindex(n), list(n), lset(n), set(n)


KEYWORDS
       assign, element, list, multiple, set, variable



Tcl                                                  8.5                                          lassign(n)