mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? cookie(
    1. ParameterCookie value
    )?,
  2. TResult? header(
    1. ParameterHeader value
    )?,
  3. TResult? query(
    1. ParameterQuery value
    )?,
  4. TResult? path(
    1. ParameterPath 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( ParameterCookie value)?  cookie,TResult? Function( ParameterHeader value)?  header,TResult? Function( ParameterQuery value)?  query,TResult? Function( ParameterPath value)?  path,}){
final _that = this;
switch (_that) {
case ParameterCookie() when cookie != null:
return cookie(_that);case ParameterHeader() when header != null:
return header(_that);case ParameterQuery() when query != null:
return query(_that);case ParameterPath() when path != null:
return path(_that);case _:
  return null;

}
}