AssetTransfer | Scripts to help transfer assets between offices | FTP library

Bit of background first; the ContractAPI that is available in Java, Go and Typescript is used to generate a 'model' of the overall contract including the data type that be passed and returned from transaction functions. (JavaScript supports a limited subset to the extent possible based on it's typing).

In order to support this there has to be a 'serializer' of some sort to process the data. The underlying chaincode API of just 'invoke(byte[]): byte[]' gives the developer the power to serialize how they wish though not all of us need to use that power.

There is a default 'serializer' in the ContractAPI; this can be swapped out if needed.

To specifically answer the question;

The return types can be:

• strings,
• numbers (for Java this is any of the primitive 'number' types)
• booleans,
• other types that have been annotated.
• arrays of the above

For the 'other types', there are annotations that can be used to define types that can also be passed to and from the transaction functions.

You might see something like this: