mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? httpStub(
    1. _HttpStub value
    )?,
  2. TResult? genericStub(
    1. _GenericStub 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(_HttpStub value)? httpStub,
  TResult? Function(_GenericStub value)? genericStub,
}) {
  final _that = this;
  switch (_that) {
    case _HttpStub() when httpStub != null:
      return httpStub(_that);
    case _GenericStub() when genericStub != null:
      return genericStub(_that);
    case _:
      return null;
  }
}