when<TResult extends Object?> method

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

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs TResult when<TResult extends Object?>(TResult Function( ExpressPaymentNethodEnabled? applePay,  ExpressPaymentNethodEnabled? googlePay,  ExpressPaymentNethodEnabled? paypal,  ExpressPaymentNethodEnabled? link,  ExpressPaymentNethodEnabled? amazonPay)  $default,) {final _that = this;
switch (_that) {
case _ExpressCheckoutPaymentMethods():
return $default(_that.applePay,_that.googlePay,_that.paypal,_that.link,_that.amazonPay);case _:
  throw StateError('Unexpected subclass');

}
}