Data update

Task/Array-length/Tcl/array-length-7.tcl

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+# The ''lindex''  command returns a single item at a given index of a list
+
+set c [lindex $fruit 2] ;#  "cherries"  (0-based index)
+
+# The ''lrange'' command returns a given range of items from a list, as a new list.
+
+set A [lrange $fruit 0 2] ;#   {apples oranges cherries} (list)
+
+# An empty list is not necessarily an empty string:
+set var { }  ;#  $var => " ",  but [llength $var] => 0