API Reference › core-bentley› Collections › ObservableSet

ObservableSet<T> Class

A standard Set that emits events when its contents change.

Extends

  • Set<T>

Methods

Name Description
constructor<T>(elements?: Iterable<T, any, any>): ObservableSet<T> Construct a new ObservableSet.  
addAll(items: Iterable<T, any, any>): number Add multiple items to the set, raising onBatchAdded only once after all items are added.  
clear(): void If this set is not already empty, invokes Set.clear  
delete(item: T): boolean Invokes Set.delete, raising  
deleteAll(items: Iterable<T, any, any>): number Delete multiple items from the set, raising onBatchDeleted only once after all items are deleted.  

Properties

Name Type Description
onAdded Readonly BeEvent<(item: T) => void> Emitted after item is added to this set.  
onBatchAdded Readonly BeEvent<() => void> Emitted after multiple items are added to this set via addAll.  
onBatchDeleted Readonly BeEvent<() => void> Emitted after multiple items are deleted from this set via deleteAll.  
onCleared Readonly BeEvent<() => void> Emitted after this set's contents are cleared.  
onDeleted Readonly BeEvent<(item: T) => void> Emitted after item is deleted from this set.  

Defined in

Last Updated: 13 March, 2026