whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>({
  1. TResult? mentionRule(
    1. MentionRule data
    )?,
  2. TResult? followerRule(
    1. FollowerRule data
    )?,
  3. TResult? followingRule(
    1. FollowingRule data
    )?,
  4. TResult? listRule(
    1. ListRule data
    )?,
  5. TResult? unknown(
    1. Map<String, dynamic> data
    )?,
})

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( MentionRule data)?  mentionRule,TResult? Function( FollowerRule data)?  followerRule,TResult? Function( FollowingRule data)?  followingRule,TResult? Function( ListRule data)?  listRule,TResult? Function( Map<String, dynamic> data)?  unknown,}) {final _that = this;
switch (_that) {
case UPostInteractionSettingsPrefThreadgateAllowRulesMentionRule() when mentionRule != null:
return mentionRule(_that.data);case UPostInteractionSettingsPrefThreadgateAllowRulesFollowerRule() when followerRule != null:
return followerRule(_that.data);case UPostInteractionSettingsPrefThreadgateAllowRulesFollowingRule() when followingRule != null:
return followingRule(_that.data);case UPostInteractionSettingsPrefThreadgateAllowRulesListRule() when listRule != null:
return listRule(_that.data);case UPostInteractionSettingsPrefThreadgateAllowRulesUnknown() when unknown != null:
return unknown(_that.data);case _:
  return null;

}
}