@rimbu/streamFastIterator<T>On this pageinterface FastIterator<T>An iterator that extends the default Iterator interface with methods that give more performance.Type parametersNameDescriptionTthe element typeMethodsfastNextReturns the next iterator value, or the given otherwise OptLazy value instead.DefinitionsfastNext(): T | undefined;fastNext<O>(otherwise: OptLazy<O>): T | O;nextReturns the next IteratorResult.Definitionnext(): IteratorResult<T>;