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-'\"
-'\" Copyright (c) 1993-1994 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH array n 8.3 Tcl "Tcl Built-In Commands"
-.so man.macros
-.BS
-'\" Note:  do not modify the .SH NAME line immediately below!
-.SH NAME
-array \- Manipulate array variables
-.SH SYNOPSIS
-\fBarray \fIoption arrayName\fR ?\fIarg arg ...\fR?
-.BE
-.SH DESCRIPTION
-.PP
-This command performs one of several operations on the
-variable given by \fIarrayName\fR.
-Unless otherwise specified for individual commands below,
-\fIarrayName\fR must be the name of an existing array variable.
-The \fIoption\fR argument determines what action is carried
-out by the command.
-The legal \fIoptions\fR (which may be abbreviated) are:
-.TP
-\fBarray anymore \fIarrayName searchId\fR
-Returns 1 if there are any more elements left to be processed
-in an array search, 0 if all elements have already been
-returned.
-\fISearchId\fR indicates which search on \fIarrayName\fR to
-check, and must have been the return value from a previous
-invocation of \fBarray startsearch\fR.
-This option is particularly useful if an array has an element
-with an empty name, since the return value from
-\fBarray nextelement\fR will not indicate whether the search
-has been completed.
-.TP
-\fBarray donesearch \fIarrayName searchId\fR
-This command terminates an array search and destroys all the
-state associated with that search.  \fISearchId\fR indicates
-which search on \fIarrayName\fR to destroy, and must have
-been the return value from a previous invocation of
-\fBarray startsearch\fR.  Returns an empty string.
-.TP
-\fBarray exists \fIarrayName\fR
-Returns 1 if \fIarrayName\fR is an array variable, 0 if there
-is no variable by that name or if it is a scalar variable.
-.TP
-\fBarray get \fIarrayName\fR ?\fIpattern\fR?
-Returns a list containing pairs of elements.  The first
-element in each pair is the name of an element in \fIarrayName\fR
-and the second element of each pair is the value of the
-array element.  The order of the pairs is undefined.
-If \fIpattern\fR is not specified, then all of the elements of the
-array are included in the result.
-If \fIpattern\fR is specified, then only those elements whose names
-match \fIpattern\fR (using the matching rules of
-\fBstring match\fR) are included.
-If \fIarrayName\fR is not the name of an array variable, or if
-the array contains no elements, then an empty list is returned.
-If traces on the array modify the list of elements, the elements
-returned are those that exist both before and after the call to
-\fBarray get\fR.
-.TP
-\fBarray names \fIarrayName\fR ?\fImode\fR? ?\fIpattern\fR?
-Returns a list containing the names of all of the elements in
-the array that match \fIpattern\fR.  \fIMode\fR may be one of
-\fB\-exact\fR, \fB\-glob\fR, or \fB\-regexp\fR.  If specified, \fImode\fR
-designates which matching rules to use to match \fIpattern\fR against
-the names of the elements in the array.  If not specified, \fImode\fR
-defaults to \fB\-glob\fR.  See the documentation for \fBstring match\fR
-for information on glob style matching, and the documentation for
-\fBregexp\fR for information on regexp matching.
-If \fIpattern\fR is omitted then the command returns all of
-the element names in the array.  If there are no (matching) elements
-in the array, or if \fIarrayName\fR is not the name of an array
-variable, then an empty string is returned.
-.TP
-\fBarray nextelement \fIarrayName searchId\fR
-Returns the name of the next element in \fIarrayName\fR, or
-an empty string if all elements of \fIarrayName\fR have
-already been returned in this search.  The \fIsearchId\fR
-argument identifies the search, and must have
-been the return value of an \fBarray startsearch\fR command.
-Warning:  if elements are added to or deleted from the array,
-then all searches are automatically terminated just as if
-\fBarray donesearch\fR had been invoked; this will cause
-\fBarray nextelement\fR operations to fail for those searches.
-.TP
-\fBarray set \fIarrayName list\fR
-Sets the values of one or more elements in \fIarrayName\fR.
-\fIlist\fR must have a form like that returned by \fBarray get\fR,
-consisting of an even number of elements.
-Each odd-numbered element in \fIlist\fR is treated as an element
-name within \fIarrayName\fR, and the following element in \fIlist\fR
-is used as a new value for that array element.
-If the variable \fIarrayName\fR does not already exist
-and \fIlist\fR is empty,
-\fIarrayName\fR is created with an empty array value.
-.TP
-\fBarray size \fIarrayName\fR
-Returns a decimal string giving the number of elements in the
-array.
-If \fIarrayName\fR is not the name of an array then 0 is returned.
-.TP
-\fBarray startsearch \fIarrayName\fR
-This command initializes an element-by-element search through the
-array given by \fIarrayName\fR, such that invocations of the
-\fBarray nextelement\fR command will return the names of the
-individual elements in the array.
-When the search has been completed, the \fBarray donesearch\fR
-command should be invoked.
-The return value is a
-search identifier that must be used in \fBarray nextelement\fR
-and \fBarray donesearch\fR commands; it allows multiple
-searches to be underway simultaneously for the same array.
-It is currently more efficient and easier to use either the \fBarray
-get\fR or \fBarray names\fR, together with \fBforeach\fR, to iterate
-over all but very large arrays.  See the examples below for how to do
-this.
-.TP
-\fBarray statistics \fIarrayName\fR
-Returns statistics about the distribution of data within the hashtable
-that represents the array.  This information includes the number of
-entries in the table, the number of buckets, and the utilization of
-the buckets.
-.TP
-\fBarray unset \fIarrayName\fR ?\fIpattern\fR?
-Unsets all of the elements in the array that match \fIpattern\fR (using the
-matching rules of \fBstring match\fR).  If \fIarrayName\fR is not the name
-of an array variable or there are no matching elements in the array, no
-error will be raised.  If \fIpattern\fR is omitted and \fIarrayName\fR is
-an array variable, then the command unsets the entire array.
-The command always returns an empty string.
-.SH EXAMPLES
-.CS
-\fBarray set\fR colorcount {
-    red   1
-    green 5
-    blue  4
-    white 9
-}
-
-foreach {color count} [\fBarray get\fR colorcount] {
-    puts "Color: $color Count: $count"
-}
-  \fB\(->\fR Color: blue Count: 4
-    Color: white Count: 9
-    Color: green Count: 5
-    Color: red Count: 1
-
-foreach color [\fBarray names\fR colorcount] {
-    puts "Color: $color Count: $colorcount($color)"
-}
-  \fB\(->\fR Color: blue Count: 4
-    Color: white Count: 9
-    Color: green Count: 5
-    Color: red Count: 1
-
-foreach color [lsort [\fBarray names\fR colorcount]] {
-    puts "Color: $color Count: $colorcount($color)"
-}
-  \fB\(->\fR Color: blue Count: 4
-    Color: green Count: 5
-    Color: red Count: 1
-    Color: white Count: 9
-
-\fBarray statistics\fR colorcount
-  \fB\(->\fR 4 entries in table, 4 buckets
-    number of buckets with 0 entries: 1
-    number of buckets with 1 entries: 2
-    number of buckets with 2 entries: 1
-    number of buckets with 3 entries: 0
-    number of buckets with 4 entries: 0
-    number of buckets with 5 entries: 0
-    number of buckets with 6 entries: 0
-    number of buckets with 7 entries: 0
-    number of buckets with 8 entries: 0
-    number of buckets with 9 entries: 0
-    number of buckets with 10 or more entries: 0
-    average search distance for entry: 1.2
-.CE
-.SH "SEE ALSO"
-list(n), string(n), variable(n), trace(n), foreach(n)
-.SH KEYWORDS
-array, element names, search