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


       array - Manipulate array variables

       array option arrayName ?arg arg ...?

       This  command  performs one of several operations on the variable given
       by arrayName.   Unless  otherwise  specified  for  individual  commands
       below,  arrayName  must be the name of an existing array variable.  The
       option argument determines what action is carried out by	 the  command.
       The legal options (which may be abbreviated) are:

       array anymore arrayName searchId
	      Returns 1 if there are any more elements left to be processed in
	      an array search, 0 if all elements have already  been  returned.
	      SearchId	indicates which search on arrayName to check, and must
	      have been the return value from a previous invocation  of	 array
	      startsearch.  This option is particularly useful if an array has
	      an element with an empty name, since the return value from array
	      nextelement  won't  indicate  whether  the  search has been com‐

       array donesearch arrayName searchId
	      This command terminates an array search  and  destroys  all  the
	      state  associated	 with  that  search.  SearchId indicates which
	      search on arrayName to destroy, and must have  been  the	return
	      value  from a previous invocation of array startsearch.  Returns
	      an empty string.

       array exists arrayName
	      Returns 1 if arrayName is an array variable, 0 if	 there	is  no
	      variable by that name or if it is a scalar variable.

       array get arrayName ?pattern?
	      Returns  a list containing pairs of elements.  The first element
	      in each pair is the name of an element in arrayName and the sec‐
	      ond element of each pair is the value of the array element.  The
	      order of the pairs is undefined.	If pattern is  not  specified,
	      then  all	 of  the  elements  of	the  array are included in the
	      result.  If pattern is specified, then only those elements whose
	      names  match  pattern  (using  the  glob-style matching rules of
	      string match) are included.  If arrayName isn't the name	of  an
	      array  variable,	or  if the array contains no elements, then an
	      empty list is returned.

       array names arrayName ?pattern?
	      Returns a list containing the names of all of  the  elements  in
	      the  array  that	match  pattern	(using the glob-style matching
	      rules of string match).  If pattern 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 arrayName isn't the name
	      of an array variable, then an empty string is returned.

       array nextelement arrayName searchId
	      Returns  the  name of the next element in arrayName, or an empty
	      string if all elements of arrayName have already	been  returned
	      in  this	search.	  The searchId argument identifies the search,
	      and must have been the return value of an array startsearch com‐
	      mand.   Warning:	 if  elements are added to or deleted from the
	      array, then all searches are automatically terminated just as if
	      array  donesearch	 had  been invoked; this will cause array nex‐
	      telement operations to fail for those searches.

       array set arrayName list
	      Sets the values of one or more elements in arrayName.  list must
	      have  a  form  like that returned by array get, consisting of an
	      even number of elements.	Each odd-numbered element in  list  is
	      treated  as  an element name within arrayName, and the following
	      element in list is used as a new value for that  array  element.
	      If  the  variable	 arrayName  does not already exist and list is
	      empty, arrayName is created with an empty array value.

       array size arrayName
	      Returns a decimal string giving the number of  elements  in  the
	      array.   If  arrayName  isn't  the  name	of  an array then 0 is

       array startsearch arrayName
	      This command initializes an  element-by-element  search  through
	      the array given by arrayName, such that invocations of the array
	      nextelement command will return the names of the individual ele‐
	      ments  in	 the  array.   When the search has been completed, the
	      array donesearch command should be invoked.  The return value is
	      a	 search	 identifier that must be used in array nextelement and
	      array donesearch commands; it allows  multiple  searches	to  be
	      underway simultaneously for the same array.

       array, element names, search

Tcl				      7.4			      array(n)

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