1array(n)                     Tcl Built-In Commands                    array(n)
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NAME

8       array - Manipulate array variables
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SYNOPSIS

11       array option arrayName ?arg arg ...?
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DESCRIPTION

15       This  command  performs one of several operations on the variable given
16       by arrayName.   Unless  otherwise  specified  for  individual  commands
17       below,  arrayName  must be the name of an existing array variable.  The
18       option argument determines what action is carried out by  the  command.
19       The legal options (which may be abbreviated) are:
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21       array anymore arrayName searchId
22              Returns 1 if there are any more elements left to be processed in
23              an array search, 0 if all elements have already  been  returned.
24              SearchId  indicates which search on arrayName to check, and must
25              have been the return value from a previous invocation  of  array
26              startsearch.  This option is particularly useful if an array has
27              an element with an empty name, since the return value from array
28              nextelement  will  not indicate whether the search has been com‐
29              pleted.
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31       array donesearch arrayName searchId
32              This command terminates an array search  and  destroys  all  the
33              state  associated  with  that  search.  SearchId indicates which
34              search on arrayName to destroy, and must have  been  the  return
35              value  from a previous invocation of array startsearch.  Returns
36              an empty string.
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38       array exists arrayName
39              Returns 1 if arrayName is an array variable, 0 if  there  is  no
40              variable by that name or if it is a scalar variable.
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42       array get arrayName ?pattern?
43              Returns  a list containing pairs of elements.  The first element
44              in each pair is the name of an element in arrayName and the sec‐
45              ond element of each pair is the value of the array element.  The
46              order of the pairs is undefined.  If pattern is  not  specified,
47              then  all  of  the  elements  of  the  array are included in the
48              result.  If pattern is specified, then only those elements whose
49              names  match  pattern (using the matching rules of string match)
50              are included.  If arrayName is not the name of  an  array  vari‐
51              able,  or  if the array contains no elements, then an empty list
52              is returned.  If traces on the array modify  the  list  of  ele‐
53              ments,  the  elements  returned are those that exist both before
54              and after the call to array get.
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56       array names arrayName ?mode? ?pattern?
57              Returns a list containing the names of all of  the  elements  in
58              the array that match pattern.  Mode may be one of -exact, -glob,
59              or -regexp.  If specified, mode designates which matching  rules
60              to use to match pattern against the names of the elements in the
61              array.  If not specified, mode defaults to -glob.  See the docu‐
62              mentation  for string match for information on glob style match‐
63              ing, and the documentation for regexp for information on  regexp
64              matching.  If pattern is omitted then the command returns all of
65              the element names in the array.  If there are no (matching) ele‐
66              ments  in the array, or if arrayName is not the name of an array
67              variable, then an empty string is returned.
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69       array nextelement arrayName searchId
70              Returns the name of the next element in arrayName, or  an  empty
71              string  if  all elements of arrayName have already been returned
72              in this search.  The searchId argument  identifies  the  search,
73              and must have been the return value of an array startsearch com‐
74              mand.  Warning:  if elements are added to or  deleted  from  the
75              array, then all searches are automatically terminated just as if
76              array donesearch had been invoked; this will  cause  array  nex‐
77              telement operations to fail for those searches.
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79       array set arrayName list
80              Sets the values of one or more elements in arrayName.  list must
81              have a form like that returned by array get,  consisting  of  an
82              even  number  of elements.  Each odd-numbered element in list is
83              treated as an element name within arrayName, and  the  following
84              element  in  list is used as a new value for that array element.
85              If the variable arrayName does not already  exist  and  list  is
86              empty, arrayName is created with an empty array value.
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88       array size arrayName
89              Returns  a  decimal  string giving the number of elements in the
90              array.  If arrayName is not the name  of  an  array  then  0  is
91              returned.
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93       array startsearch arrayName
94              This  command  initializes  an element-by-element search through
95              the array given by arrayName, such that invocations of the array
96              nextelement command will return the names of the individual ele‐
97              ments in the array.  When the search  has  been  completed,  the
98              array donesearch command should be invoked.  The return value is
99              a search identifier that must be used in array  nextelement  and
100              array  donesearch  commands;  it  allows multiple searches to be
101              underway simultaneously for the same  array.   It  is  currently
102              more  efficient  and easier to use either the array get or array
103              names, together with foreach, to iterate over all but very large
104              arrays.  See the examples below for how to do this.
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106       array statistics arrayName
107              Returns  statistics  about  the  distribution of data within the
108              hashtable that represents the array.  This information  includes
109              the  number  of entries in the table, the number of buckets, and
110              the utilization of the buckets.
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112       array unset arrayName ?pattern?
113              Unsets all of the elements  in  the  array  that  match  pattern
114              (using the matching rules of string match).  If arrayName is not
115              the name of an array variable or there are no matching  elements
116              in  the  array,  no error will be raised.  If pattern is omitted
117              and arrayName is an array variable, then the command unsets  the
118              entire array.  The command always returns an empty string.
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EXAMPLES

121              array set colorcount {
122                 red   1
123                 green 5
124                 blue  4
125                 white 9
126              }
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128              foreach {color count} [array get colorcount] {
129                 puts "Color: $color Count: $count"
130              }
131                Color: blue Count: 4
132                  Color: white Count: 9
133                  Color: green Count: 5
134                  Color: red Count: 1
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136              foreach color [array names colorcount] {
137                 puts "Color: $color Count: $colorcount($color)"
138              }
139                Color: blue Count: 4
140                  Color: white Count: 9
141                  Color: green Count: 5
142                  Color: red Count: 1
143
144              foreach color [lsort [array names colorcount]] {
145                 puts "Color: $color Count: $colorcount($color)"
146              }
147                Color: blue Count: 4
148                  Color: green Count: 5
149                  Color: red Count: 1
150                  Color: white Count: 9
151
152              array statistics colorcount
153                4 entries in table, 4 buckets
154                  number of buckets with 0 entries: 1
155                  number of buckets with 1 entries: 2
156                  number of buckets with 2 entries: 1
157                  number of buckets with 3 entries: 0
158                  number of buckets with 4 entries: 0
159                  number of buckets with 5 entries: 0
160                  number of buckets with 6 entries: 0
161                  number of buckets with 7 entries: 0
162                  number of buckets with 8 entries: 0
163                  number of buckets with 9 entries: 0
164                  number of buckets with 10 or more entries: 0
165                  average search distance for entry: 1.2
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SEE ALSO

168       list(n), string(n), variable(n), trace(n), foreach(n)
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KEYWORDS

171       array, element names, search
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175Tcl                                   8.3                             array(n)
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