mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? formData(
    1. _FormData value
    )?,
  2. TResult? basic(
    1. _Basic value
    )?,
  3. TResult? data(
    1. _Data 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( _FormData value)?  formData,TResult? Function( _Basic value)?  basic,TResult? Function( _Data value)?  data,}){
final _that = this;
switch (_that) {
case _FormData() when formData != null:
return formData(_that);case _Basic() when basic != null:
return basic(_that);case _Data() when data != null:
return data(_that);case _:
  return null;

}
}