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







lreplace - Replace elements in a list with new elements








lreplace list first last ?element element
    ...?










lreplace returns a new list formed by replacing one or more
    elements of list with the element arguments. first and
    last are index values specifying the first and last elements of the
    range to replace. The index values first and last are
    interpreted the same as index values for the command string index,
    supporting simple index arithmetic and indices relative to the end of the
    list. 0 refers to the first element of the list, and end refers to
    the last element of the list. If list is empty, then first and
    last are ignored.


If first is less than zero, it is considered to refer to
    before the first element of the list. For non-empty lists, the element
    indicated by first must exist or first must indicate before
    the start of the list.


If last is less than first, then any specified
    elements will be inserted into the list at the point specified by
    first with no elements being deleted.


The element arguments specify zero or more new arguments to
    be added to the list in place of those that were deleted. Each
    element argument will become a separate element of the list. If no
    element arguments are specified, then the elements between
    first and last are simply deleted. If list is empty,
    any element arguments are added to the end of the list.








Replacing an element of a list with another:




% lreplace {a b c d e} 1 1 foo
a foo c d e




Replacing two elements of a list with three:




% lreplace {a b c d e} 1 2 three more elements
a three more elements d e




Deleting the last element from a list in a variable:




% set var {a b c d e}
a b c d e
% set var [lreplace $var end end]
a b c d




A procedure to delete a given element from a list:




proc lremove {listVariable value} {


    upvar 1 $listVariable var


    set idx [lsearch -exact $var $value]


    set var [lreplace $var $idx $idx]
}










list(n), lappend(n), lindex(n), linsert(n), llength(n),
    lsearch(n), lset(n), lrange(n), lsort(n), string(n)








element, list, replace







  

    7.4
    Tcl