whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. int total,
    2. int spent,
    3. int left,
    4. @JsonKey.new(name: 'key_total') int? keyTotal,
    5. @JsonKey.new(name: 'key_spent') int keySpent,
    6. @JsonKey.new(name: 'key_left') int? keyLeft,
    7. @JsonKey.new(name: 'limited_by', unknownEnumValue: PlanLimitAllowance.unknown) PlanLimitAllowance limitedBy,
    )?
)

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( int total,  int spent,  int left, @JsonKey(name: 'key_total')  int? keyTotal, @JsonKey(name: 'key_spent')  int keySpent, @JsonKey(name: 'key_left')  int? keyLeft, @JsonKey(name: 'limited_by', unknownEnumValue: PlanLimitAllowance.unknown)  PlanLimitAllowance limitedBy)?  $default,) {final _that = this;
switch (_that) {
case _PlanLimit() when $default != null:
return $default(_that.total,_that.spent,_that.left,_that.keyTotal,_that.keySpent,_that.keyLeft,_that.limitedBy);case _:
  return null;

}
}