lrange(n) [mojave man page]

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

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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  rela- |
       tive 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 elements 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(n), lappend(n), lindex(n), linsert(n), llength(n), lsearch(n), lset(n), lreplace(n), lsort(n), string(n)				   |

KEYWORDS

       element, list, range, sublist

Tcl									7.4								 lrange(n)

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

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NAME

       lindex - Retrieve an element from a list

SYNOPSIS

       lindex list ?index...?
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DESCRIPTION

       The  lindex  command  accepts  a  parameter,  list, which it treats as a Tcl list. It also accepts zero or more indices into the list.  The
       indices may be presented either consecutively on the command line, or grouped in a Tcl list and presented as a single argument.

       If no indices are presented, the command takes the form:
	      lindex list
       or
	      lindex list {}
       In this case, the return value of lindex is simply the value of the list parameter.

       When presented with a single index, the lindex command treats list as a Tcl list and returns the index'th element from it (0 refers to  the
       first  element of the list).  In extracting the element, lindex observes the same rules concerning braces and quotes and backslashes as the
       Tcl command interpreter; however, variable substitution and command substitution do not occur.  If index is negative  or  greater  than	or
       equal  to  the number of elements in value, then an empty string is returned.  The interpretation of each simple index value is the same as |
       for the command string index, supporting simple index arithmetic and indices relative to the end of the list.

       If additional index arguments are supplied, then each argument is used in turn to select an element from the previous  indexing	operation,
       allowing the script to select elements from sublists.  The command,
	      lindex $a 1 2 3
       or
	      lindex $a {1 2 3}
       is synonymous with
	      lindex [lindex [lindex $a 1] 2] 3

EXAMPLES

	      lindex {a b c}
		    -> a b c
	      lindex {a b c} {}
		    -> a b c
	      lindex {a b c} 0
		    -> a
	      lindex {a b c} 2
		    -> c
	      lindex {a b c} end
		    -> c
	      lindex {a b c} end-1
		    -> b
	      lindex {{a b c} {d e f} {g h i}} 2 1
		    -> h
	      lindex {{a b c} {d e f} {g h i}} {2 1}
		    -> h
	      lindex {{{a b} {c d}} {{e f} {g h}}} 1 1 0
		    -> g
	      lindex {{{a b} {c d}} {{e f} {g h}}} {1 1 0}
		    -> g

SEE ALSO

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

KEYWORDS

       element, index, list

Tcl									8.4								 lindex(n)