whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. List<NavigationItem>? primaryActions,
    2. List<NavigationItem>? secondaryActions,
    3. int drawerSelectedIndex,
    4. int bottomBarSelectedIndex,
    )?
)

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: 'primary')  List<NavigationItem>? primaryActions, @JsonKey(name: 'secondary')  List<NavigationItem>? secondaryActions, @JsonKey(defaultValue: -1)  int drawerSelectedIndex, @JsonKey(defaultValue: 0)  int bottomBarSelectedIndex)?  $default,) {final _that = this;
switch (_that) {
case _Navigation() when $default != null:
return $default(_that.primaryActions,_that.secondaryActions,_that.drawerSelectedIndex,_that.bottomBarSelectedIndex);case _:
  return null;

}
}