Item (NamedArraylist property)

From m204wiki
Revision as of 09:07, 4 March 2011 by Goff (talk | contribs) (match syntax table to diagram, lots of tags, some edits)
Jump to navigation Jump to search

Value of named item (NamedArraylist class)


Item is a ReadWrite property returns or sets the value of the item that has the given name in the NamedArraylist.

For additional comments about the Item method in collections, see "Coding considerations for collections".

Syntax

%currentItem = nal:Item( string) nal:Item( string) = newItem Throws ItemNotPresent

Syntax terms

%currentItem A variable of the same type as specified on the nal declaration to contain the value of the specified nal item.
nal A NamedArraylist object.
string A string that serves as a subscript to identify a nal item.
newItem A variable or value of the same type as specified on the nal declaration to be assigned to the specified nal item.

Usage notes

  • If the Item property is being set and there is already an item on the NamedArraylist that has the specified name, that item is replaced. If the Item property is being set and there is no item on the NamedArraylist that has the indicated name, the item is added. If the Item property is being retrieved and there is no item on the NamedArraylist that has the indicated name, the result is one of the following actions:
    • The request is cancelled if the UseDefault property value is False.
    • The Default value is returned if the UseDefault property is True.
  • The Item keyword is not required. For example, in the request at the start of the NamedArraylist class, %alist('Idle') = 'Eric', for instance, is equivalent to:

    %alist:Item('Idle') = 'Eric'

  • As shown in the example at the start of the NamedArraylist class, NamedArraylist items are ordered alphabetically by their names. Accordingly, the Item method takes a name argument string.

See also

  • The ItemByNumber method, lets you retrieve or set an item using its item number.