whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. double? height,
    2. ExpressCheckoutButtonTheme? buttonTheme,
    3. ExpressCheckoutButtonType? buttonType,
    4. ExpressCheckoutLayout? layout,
    5. ExpressCheckoutPaymentMethods? paymentMethods,
    )?
)

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( double? height,  ExpressCheckoutButtonTheme? buttonTheme,  ExpressCheckoutButtonType? buttonType,  ExpressCheckoutLayout? layout,  ExpressCheckoutPaymentMethods? paymentMethods)?  $default,) {final _that = this;
switch (_that) {
case _ExpressCheckoutOptions() when $default != null:
return $default(_that.height,_that.buttonTheme,_that.buttonType,_that.layout,_that.paymentMethods);case _:
  return null;

}
}