whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String? id,
    2. String? iconUrl,
    3. String? iconTitle,
    4. String? iconDescription,
    )?
)

A variant of when that fallback to returning null

It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? Function(@JsonKey(name: 'id')  String? id, @JsonKey(name: 'url')  String? iconUrl, @JsonKey(name: 'title')  String? iconTitle, @JsonKey(name: 'description')  String? iconDescription)?  $default,) {final _that = this;
switch (_that) {
case _NavigationIcon() when $default != null:
return $default(_that.id,_that.iconUrl,_that.iconTitle,_that.iconDescription);case _:
  return null;

}
}