when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. @JsonKey.new(name: 'data') List<UpdatedBook> updates,
    2. int? total,
    3. int page,
    4. @JsonKey.new(name: 'page_size') int pageSize,
    )
)

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs TResult when<TResult extends Object?>(TResult Function(@JsonKey(name: 'data')  List<UpdatedBook> updates,  int? total,  int page, @JsonKey(name: 'page_size')  int pageSize)  $default,) {final _that = this;
switch (_that) {
case _UpdatedBookFeed():
return $default(_that.updates,_that.total,_that.page,_that.pageSize);}
}