whenOrNull<TResult extends Object?> method

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>({ TResult? bytes(double value)?, TResult? kb(double value)?, TResult? mb(double value)?, TResult? gb(double value)?, TResult? tb(double value)?, })

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 value)?  bytes,TResult? Function( double value)?  kb,TResult? Function( double value)?  mb,TResult? Function( double value)?  gb,TResult? Function( double value)?  tb,}) {final _that = this;
switch (_that) {
case BytesModel() when bytes != null:
return bytes(_that.value);case KbModel() when kb != null:
return kb(_that.value);case MbModel() when mb != null:
return mb(_that.value);case GbModel() when gb != null:
return gb(_that.value);case TbModel() when tb != null:
return tb(_that.value);case _:
  return null;

}
}