mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? getKeys(
    1. HiveGetKeys value
    )?,
  2. TResult? getBoxList(
    1. HiveGetBoxs value
    )?,
  3. TResult? getValue(
    1. HiveGetValue value
    )?,
})

A variant of map that fallback to returning null.

It is equivalent to doing:

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

Implementation

@optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  TResult? Function(HiveGetKeys value)? getKeys,
  TResult? Function(HiveGetBoxs value)? getBoxList,
  TResult? Function(HiveGetValue value)? getValue,
}) {
  final _that = this;
  switch (_that) {
    case HiveGetKeys() when getKeys != null:
      return getKeys(_that);
    case HiveGetBoxs() when getBoxList != null:
      return getBoxList(_that);
    case HiveGetValue() when getValue != null:
      return getValue(_that);
    case _:
      return null;
  }
}