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union


>>-union(argument)---------------------------------------------><

Returns a new Set contains all the items from the receiver collection and selected items from the [argument] collection. This method includes an item from [argument] in the new collection only if there is no item already in the in the receiver collection and the method has not already included a matching item. The order in which this method selects items in [argument] is unspecified. The [argument] can be any collection class object. The [argument] must also allow all of the index values in the receiver collection.

Read Me - Common Public License V1.0 - Copyright Notice(©)