mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? transfer(
    1. ParsedSplTokenTransferInstruction value
    )?,
  2. TResult? transferChecked(
    1. ParsedSplTokenTransferCheckedInstruction value
    )?,
  3. TResult? generic(
    1. ParsedSplTokenGenericInstruction 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( ParsedSplTokenTransferInstruction value)?  transfer,TResult? Function( ParsedSplTokenTransferCheckedInstruction value)?  transferChecked,TResult? Function( ParsedSplTokenGenericInstruction value)?  generic,}){
final _that = this;
switch (_that) {
case ParsedSplTokenTransferInstruction() when transfer != null:
return transfer(_that);case ParsedSplTokenTransferCheckedInstruction() when transferChecked != null:
return transferChecked(_that);case ParsedSplTokenGenericInstruction() when generic != null:
return generic(_that);case _:
  return null;

}
}