mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? mentionRule(
    1. UFeedThreadgateAllowMentionRule value
    )?,
  2. TResult? followerRule(
    1. UFeedThreadgateAllowFollowerRule value
    )?,
  3. TResult? followingRule(
    1. UFeedThreadgateAllowFollowingRule value
    )?,
  4. TResult? unknown(
    1. UFeedThreadgateAllowUnknown 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( UFeedThreadgateAllowMentionRule value)?  mentionRule,TResult? Function( UFeedThreadgateAllowFollowerRule value)?  followerRule,TResult? Function( UFeedThreadgateAllowFollowingRule value)?  followingRule,TResult? Function( UFeedThreadgateAllowUnknown value)?  unknown,}){
final _that = this;
switch (_that) {
case UFeedThreadgateAllowMentionRule() when mentionRule != null:
return mentionRule(_that);case UFeedThreadgateAllowFollowerRule() when followerRule != null:
return followerRule(_that);case UFeedThreadgateAllowFollowingRule() when followingRule != null:
return followingRule(_that);case UFeedThreadgateAllowUnknown() when unknown != null:
return unknown(_that);case _:
  return null;

}
}