future

evaluates a set of forms asynchronously

Returns a promise whose expressions are immediately evaluated in another thread of execution.

An Example

(define fut (future
  (seq->vector (generate
    (emit "red")
    (emit "orange")
    (emit "yellow")))))

(fut)

This example produces a promise called fut that converts the results of an asynchronous block into a vector. The (fut) call will block until the future returns a value.