ReadOnlyObservableCollection.find

API / ReadOnlyObservableCollection<TItem> / find method

Returns the first item for which the provided predicate evaluated to true, if no item can be found then undefined is returned.

This is a public method.

public find(predicate: (item: TItem, index: number, collection: IReadOnlyObservableCollection<TItem>) => boolean): TItem | undefined

Parameters

• predicate: Function, the callback performing the item check.

  Parameters:

  • item: TItem, the item being evaluated.
  • index: Number, the index of the item being evaluated.
  • collection: IReadOnlyObservableCollection<TItem>, the collection being iterated.

  Returns: Boolean

  Returns true if the provided item satisfies the condition; false otherwise.

Returns: TItem

Returns the first item for which the provided predicate evaluates to true; otherwise undefined.

See

• Array.find

---

Returns the first item for which the provided predicate evaluated to true, if no item can be found then undefined is returned.

This is a public method.

public find<TContext>(predicate: (this: TContext, item: TItem, index: number, collection: IReadOnlyObservableCollection<TItem>) => boolean, thisArg: TContext): TItem | undefined

Template Parameters

• TContext: the context type in which the callback is executed.

Parameters

• predicate: Function, the callback performing the item check.

  Parameters:

  • item: TItem, the item being evaluated.
  • index: Number, the index of the item being evaluated.
  • collection: IReadOnlyObservableCollection<TItem>, the collection being iterated.

  Returns: Boolean

  Returns true if the provided item satisfies the condition; false otherwise.
• thisArg: TContext, a value to use as context when checking items.

Returns: TItem

Returns the first item for which the provided predicate evaluates to true; otherwise undefined.

See

• Array.find

---

Returns the first item for which the provided predicate evaluated to true, if no item can be found then undefined is returned.

This is a public method.

public find<TResult extends TItem>(predicate: (item: TItem, index: number, collection: IReadOnlyObservableCollection<TItem>) => item is TResult): TResult | undefined

Template Parameters

• TResult: the type of item to find.
  Must extend TItem.

Parameters

• predicate: Function, the callback performing the item check.

  Parameters:

  • item: TItem, the item being evaluated.
  • index: Number, the index of the item being evaluated.
  • collection: IReadOnlyObservableCollection<TItem>, the collection being iterated.

  Returns: Boolean

  Returns true if the provided item satisfies the condition; false otherwise.

Returns: TResult

Returns the first item for which the provided predicate evaluates to true; otherwise undefined.

See

• Array.find

---

Returns the first item for which the provided predicate evaluated to true, if no item can be found then undefined is returned.

This is a public method.

public find<TResult extends TItem, TContext>(predicate: (this: TContext, item: TItem, index: number, collection: IReadOnlyObservableCollection<TItem>) => item is TResult, thisArg: TContext): TResult | undefined

Template Parameters

• TResult: the type of item to find.
  Must extend TItem.
• TContext: the context type in which the callback is executed.

Parameters

• predicate: Function, the callback performing the item check.

  Parameters:

  • item: TItem, the item being evaluated.
  • index: Number, the index of the item being evaluated.
  • collection: IReadOnlyObservableCollection<TItem>, the collection being iterated.

  Returns: Boolean

  Returns true if the provided item satisfies the condition; false otherwise.
• thisArg: TContext, a value to use as context when checking items.

Returns: TResult

Returns the first item for which the provided predicate evaluates to true; otherwise undefined.

See

• Array.find