when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>({
  1. required TResult legacy(
    1. MessageHeader header,
    2. List<Ed25519HDPublicKey> accountKeys,
    3. String recentBlockhash,
    4. List<CompiledInstruction> instructions,
    ),
  2. required TResult v0(
    1. MessageHeader header,
    2. List<Ed25519HDPublicKey> accountKeys,
    3. String recentBlockhash,
    4. List<CompiledInstruction> instructions,
    5. List<MessageAddressTableLookup> addressTableLookups,
    ),
})

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs TResult when<TResult extends Object?>({required TResult Function( MessageHeader header,  List<Ed25519HDPublicKey> accountKeys,  String recentBlockhash,  List<CompiledInstruction> instructions)  legacy,required TResult Function( MessageHeader header,  List<Ed25519HDPublicKey> accountKeys,  String recentBlockhash,  List<CompiledInstruction> instructions,  List<MessageAddressTableLookup> addressTableLookups)  v0,}) {final _that = this;
switch (_that) {
case CompiledMessageLegacy():
return legacy(_that.header,_that.accountKeys,_that.recentBlockhash,_that.instructions);case CompiledMessageV0():
return v0(_that.header,_that.accountKeys,_that.recentBlockhash,_that.instructions,_that.addressTableLookups);}
}