mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? delegated(
    1. StakeProgramDelegatedAccountData value
    )?,
  2. TResult? initialize(
    1. StakeProgramInitializedAccountData value
    )?,
  3. TResult? unknown(
    1. StakeProgramUnknownAccountData 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( StakeProgramDelegatedAccountData value)?  delegated,TResult? Function( StakeProgramInitializedAccountData value)?  initialize,TResult? Function( StakeProgramUnknownAccountData value)?  unknown,}){
final _that = this;
switch (_that) {
case StakeProgramDelegatedAccountData() when delegated != null:
return delegated(_that);case StakeProgramInitializedAccountData() when initialize != null:
return initialize(_that);case StakeProgramUnknownAccountData() when unknown != null:
return unknown(_that);case _:
  return null;

}
}