mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? bytes(
    1. BytesModel value
    )?,
  2. TResult? kb(
    1. KbModel value
    )?,
  3. TResult? mb(
    1. MbModel value
    )?,
  4. TResult? gb(
    1. GbModel value
    )?,
  5. TResult? tb(
    1. TbModel value
    )?,
})

A variant of map that fallback to returning null.

It is equivalent to doing:

switch (sealedClass) {
  case final Subclass value:
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs TResult? mapOrNull<TResult extends Object?>({TResult? Function( BytesModel value)?  bytes,TResult? Function( KbModel value)?  kb,TResult? Function( MbModel value)?  mb,TResult? Function( GbModel value)?  gb,TResult? Function( TbModel value)?  tb,}){
final _that = this;
switch (_that) {
case BytesModel() when bytes != null:
return bytes(_that);case KbModel() when kb != null:
return kb(_that);case MbModel() when mb != null:
return mb(_that);case GbModel() when gb != null:
return gb(_that);case TbModel() when tb != null:
return tb(_that);case _:
  return null;

}
}