lrange(3tcl) Tcl Built-In Commands lrange(3tcl)
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NAME
lrange - Return one or more adjacent elements from a list
SYNOPSIS
lrange list first last
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DESCRIPTION
List must be a valid Tcl list. This command will return a new list
consisting of elements first through last, inclusive. 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. If first is less than zero, it is treated as
if it were zero. If last is greater than or equal to the number of el-
ements in the list, then it is treated as if it were end. If first is
greater than last then an empty string is returned. Note: “lrange list
first first” does not always produce the same result as “lindex list
first” (although it often does for simple fields that are not enclosed
in braces); it does, however, produce exactly the same results as “list
[lindex list first]”
EXAMPLES
Selecting the first two elements:
% lrange {a b c d e} 0 1
a b
Selecting the last three elements:
% lrange {a b c d e} end-2 end
c d e
Selecting everything except the first and last element:
% lrange {a b c d e} 1 end-1
b c d
Selecting a single element with lrange is not the same as doing so with
lindex:
% set var {some {elements to} select}
some {elements to} select
% lindex $var 1
elements to
% lrange $var 1 1
{elements to}
SEE ALSO
list(3tcl), lappend(3tcl), lindex(3tcl), linsert(3tcl), llength(3tcl),
lsearch(3tcl), lset(3tcl), lreplace(3tcl), lsort(3tcl), string(3tcl)
KEYWORDS
element, list, range, sublist
Tcl 7.4 lrange(3tcl)
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