maybeWhen<TResult extends Object?> method

  1. @optionalTypeArgs
TResult maybeWhen<TResult extends Object?>({
  1. TResult system(
    1. String programId,
    2. ParsedSystemInstruction parsed
    )?,
  2. TResult splToken(
    1. ParsedSplTokenInstruction parsed
    )?,
  3. TResult memo(
    1. @JsonKey.new(name: 'parsed') String? memo
    )?,
  4. TResult unsupported(
    1. String? program
    )?,
  5. required TResult orElse(),
})

A variant of when that fallback to an orElse callback.

It is equivalent to doing:

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

Implementation

@optionalTypeArgs TResult maybeWhen<TResult extends Object?>({TResult Function( String programId,  ParsedSystemInstruction parsed)?  system,TResult Function( ParsedSplTokenInstruction parsed)?  splToken,TResult Function(@JsonKey(name: 'parsed')  String? memo)?  memo,TResult Function( String? program)?  unsupported,required TResult orElse(),}) {final _that = this;
switch (_that) {
case ParsedInstructionSystem() when system != null:
return system(_that.programId,_that.parsed);case ParsedInstructionSplToken() when splToken != null:
return splToken(_that.parsed);case ParsedInstructionMemo() when memo != null:
return memo(_that.memo);case ParsedInstructionUnsupported() when unsupported != null:
return unsupported(_that.program);case _:
  return orElse();

}
}