whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. ExpressPaymentNethodEnabled? applePay,
    2. ExpressPaymentNethodEnabled? googlePay,
    3. ExpressPaymentNethodEnabled? paypal,
    4. ExpressPaymentNethodEnabled? link,
    5. ExpressPaymentNethodEnabled? amazonPay,
    )?
)

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( ExpressPaymentNethodEnabled? applePay,  ExpressPaymentNethodEnabled? googlePay,  ExpressPaymentNethodEnabled? paypal,  ExpressPaymentNethodEnabled? link,  ExpressPaymentNethodEnabled? amazonPay)?  $default,) {final _that = this;
switch (_that) {
case _ExpressCheckoutPaymentMethods() when $default != null:
return $default(_that.applePay,_that.googlePay,_that.paypal,_that.link,_that.amazonPay);case _:
  return null;

}
}