mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? deposit(
    1. QuoteStepDeposit value
    )?,
  2. TResult? transaction(
    1. QuoteStepTransaction 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( QuoteStepDeposit value)?  deposit,TResult? Function( QuoteStepTransaction value)?  transaction,}){
final _that = this;
switch (_that) {
case QuoteStepDeposit() when deposit != null:
return deposit(_that);case QuoteStepTransaction() when transaction != null:
return transaction(_that);case _:
  return null;

}
}