> the client is not packaging up all its logic and sending a single blob that describes the fully-chained logic to the server on its initial request. Right

See "But how do we solve arrays" part:

> > .map() is special. It does not send JavaScript code to the server, but it does send something like "code", restricted to a domain-specific, non-Turing-complete language. The "code" is a list of instructions that the server should carry out for each member of the array