whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>({
  1. TResult? delegated(
    1. StakeDelegatedAccountInfo info
    )?,
  2. TResult? initialize(
    1. StakeInitializedAccountInfo info
    )?,
  3. TResult? unknown(
    1. Map<String, dynamic> info
    )?,
})

A variant of when that fallback to returning null

It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>({TResult? Function( StakeDelegatedAccountInfo info)?  delegated,TResult? Function( StakeInitializedAccountInfo info)?  initialize,TResult? Function( Map<String, dynamic> info)?  unknown,}) {final _that = this;
switch (_that) {
case StakeProgramDelegatedAccountData() when delegated != null:
return delegated(_that.info);case StakeProgramInitializedAccountData() when initialize != null:
return initialize(_that.info);case StakeProgramUnknownAccountData() when unknown != null:
return unknown(_that.info);case _:
  return null;

}
}