when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String? authority,
    2. String? serviceName,
    3. bool? multiMode,
    4. @JsonKey.new(name: 'idle_timeout') int? idleTimeout,
    5. @JsonKey.new(name: 'health_check_timeout') int? healthCheckTimeout,
    6. @JsonKey.new(name: 'permit_without_stream') bool? permitWithoutStream,
    7. @JsonKey.new(name: 'initial_windows_size') int? initialWindowsSize,
    8. @JsonKey.new(name: 'user_agent') String? userAgent,
    )
)

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs TResult when<TResult extends Object?>(TResult Function( String? authority,  String? serviceName,  bool? multiMode, @JsonKey(name: 'idle_timeout')  int? idleTimeout, @JsonKey(name: 'health_check_timeout')  int? healthCheckTimeout, @JsonKey(name: 'permit_without_stream')  bool? permitWithoutStream, @JsonKey(name: 'initial_windows_size')  int? initialWindowsSize, @JsonKey(name: 'user_agent')  String? userAgent)  $default,) {final _that = this;
switch (_that) {
case _GRPCConfig():
return $default(_that.authority,_that.serviceName,_that.multiMode,_that.idleTimeout,_that.healthCheckTimeout,_that.permitWithoutStream,_that.initialWindowsSize,_that.userAgent);case _:
  throw StateError('Unexpected subclass');

}
}