mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? account(
    1. TokenAccountData value
    )?,
  2. TResult? mint(
    1. MintAccountData value
    )?,
  3. TResult? unknown(
    1. UnknownAccountData 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( TokenAccountData value)?  account,TResult? Function( MintAccountData value)?  mint,TResult? Function( UnknownAccountData value)?  unknown,}){
final _that = this;
switch (_that) {
case TokenAccountData() when account != null:
return account(_that);case MintAccountData() when mint != null:
return mint(_that);case UnknownAccountData() when unknown != null:
return unknown(_that);case _:
  return null;

}
}