mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? never(
    1. ExpirationNever value
    )?,
  2. TResult? timeout(
    1. ExpirationTimeout value
    )?,
  3. TResult? timestamp(
    1. ExpirationTimestamp 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( ExpirationNever value)?  never,TResult? Function( ExpirationTimeout value)?  timeout,TResult? Function( ExpirationTimestamp value)?  timestamp,}){
final _that = this;
switch (_that) {
case ExpirationNever() when never != null:
return never(_that);case ExpirationTimeout() when timeout != null:
return timeout(_that);case ExpirationTimestamp() when timestamp != null:
return timestamp(_that);case _:
  return null;

}
}