mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? reasonRepost(
    1. UFeedViewPostReasonReasonRepost value
    )?,
  2. TResult? reasonPin(
    1. UFeedViewPostReasonReasonPin value
    )?,
  3. TResult? unknown(
    1. UFeedViewPostReasonUnknown 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( UFeedViewPostReasonReasonRepost value)?  reasonRepost,TResult? Function( UFeedViewPostReasonReasonPin value)?  reasonPin,TResult? Function( UFeedViewPostReasonUnknown value)?  unknown,}){
final _that = this;
switch (_that) {
case UFeedViewPostReasonReasonRepost() when reasonRepost != null:
return reasonRepost(_that);case UFeedViewPostReasonReasonPin() when reasonPin != null:
return reasonPin(_that);case UFeedViewPostReasonUnknown() when unknown != null:
return unknown(_that);case _:
  return null;

}
}