when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String returnTypeName,
    2. String? returnTypeFullLibraryName,
    3. String name,
    4. bool isDeprecated,
    5. bool isExperimental,
    6. List<ExecutableParameterDeclaration> parameters,
    7. List<String> typeParameterNames,
    8. ExecutableType type,
    9. bool isStatic,
    10. Set<String>? entryPoints,
    11. String relativePath,
    )
)

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 returnTypeName,
          String? returnTypeFullLibraryName,
          String name,
          bool isDeprecated,
          bool isExperimental,
          List<ExecutableParameterDeclaration> parameters,
          List<String> typeParameterNames,
          ExecutableType type,
          bool isStatic,
          Set<String>? entryPoints,
          String relativePath)
      $default,
) {
  final _that = this;
  switch (_that) {
    case _ExecutableDeclaration():
      return $default(
          _that.returnTypeName,
          _that.returnTypeFullLibraryName,
          _that.name,
          _that.isDeprecated,
          _that.isExperimental,
          _that.parameters,
          _that.typeParameterNames,
          _that.type,
          _that.isStatic,
          _that.entryPoints,
          _that.relativePath);
  }
}