NAME

       lassign - Assign list elements to variables

SYNOPSIS

       lassign list ?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 elements, 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(3tcl), list(3tcl), lrange(3tcl), lset(3tcl), set(3tcl)

KEYWORDS

       assign, element, list, multiple, set, variable