| async-package {async} | R Documentation |
The async package allows you to write sequential-looking code that can
pause, return control to R, then pick up where it left off.
Async constructs include generators and async/await blocks.
A generator runs until it yields a value and then stops, returning control to R until another value is requested. An async block can pause and return control to R until some data is available, then resume. Generators implement the iterator interface, while async blocks implement the promise interface.
gen(...) creates a generator (an iterator); within a generator use
yield(x) to return a value.
async(...) creates an async block (a promise); within the async
write await(x) to pause on x (another promise).
Peter Meilstrup