ReadOnlyObservableCollection.flatMap

API / ReadOnlyObservableCollection<TItem> / flatMap method

Returns a new JavaScript Array by mapping all items in the collection and the flattening the result by one level.

This is a public method.

public flatMap<TResult>(callback: (item: TItem, index: number, collection: IReadOnlyObservableCollection<TItem>) => TResult | readonly TResult[]): TResult[]

Template Parameters

• TResult: the type to map each item to.

Parameters

• callback: Function, the callback mapping each item.

  Parameters:

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

  Returns: TResult or readonly TResult[]

  Returns the mapped item(s).

Returns: TResult[]

Returns a mapped and one level flattened Array.

See

• Array.flatMap

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Returns a new JavaScript Array by mapping all items in the collection and the flattening the result by one level.

This is a public method.

public flatMap<TResult, TContext>(callback: (item: TItem, index: number, collection: IReadOnlyObservableCollection<TItem>) => TResult | readonly TResult[], thisArg: TContext): TResult[]

Template Parameters

• TResult: the type to map each item to.
• TContext: the context type in which the callback is executed.

Parameters

• callback: Function, the callback mapping each item.

  Parameters:

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

  Returns: TResult or readonly TResult[]

  Returns the mapped item(s).
• thisArg: TContext, a value to use as context when evaluating items.

Returns: TResult[]

Returns a mapped and one level flattened Array.

See

• Array.flatMap