mapOrNull<TResult extends Object?> method

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

}
}