mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? empty(
    1. SocketSendModelEmpty value
    )?,
  2. TResult? sp(
    1. SpViewSendModel value
    )?,
  3. TResult? ping(
    1. PingViewSendModel 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(SocketSendModelEmpty value)? empty,
  TResult? Function(SpViewSendModel value)? sp,
  TResult? Function(PingViewSendModel value)? ping,
}) {
  final _that = this;
  switch (_that) {
    case SocketSendModelEmpty() when empty != null:
      return empty(_that);
    case SpViewSendModel() when sp != null:
      return sp(_that);
    case PingViewSendModel() when ping != null:
      return ping(_that);
    case _:
      return null;
  }
}