mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? openUrl(
    1. OpenUrlAction value
    )?,
  2. TResult? sendMessage(
    1. SendMessageAction value
    )?,
  3. TResult? callback(
    1. CallbackAction 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( OpenUrlAction value)?  openUrl,TResult? Function( SendMessageAction value)?  sendMessage,TResult? Function( CallbackAction value)?  callback,}){
final _that = this;
switch (_that) {
case OpenUrlAction() when openUrl != null:
return openUrl(_that);case SendMessageAction() when sendMessage != null:
return sendMessage(_that);case CallbackAction() when callback != null:
return callback(_that);case _:
  return null;

}
}