maybeWhen<TResult extends Object?> method

TResult maybeWhen<TResult extends Object?>(
  1. TResult callback(
    1. String isbn13,
    2. DateTime updatedAt
    )?, {
  2. required TResult orElse(),
})

Invoke the original callback when supplied, otherwise use orElse.

Implementation

TResult maybeWhen<TResult extends Object?>(
  TResult Function(String isbn13, DateTime updatedAt)? callback, {
  required TResult Function() orElse,
}) => callback == null ? orElse() : callback(isbn13, updatedAt);