async_until: Repeatedly call task until it its test function returns...

In r-lib/async: Asynchronous Computation and 'I/O'

Repeatedly call task until it its test function returns TRUE

Description

Repeatedly call task until it its test function returns TRUE

Usage

async_until(test, task, ...)

Arguments

test	Synchronous test function.
task	Asynchronous function to call repeatedly.
...	Arguments to pass to task.

Value

Deferred value, that is resolved when the iteration is done.

See Also

Other async control flow: async_backoff(), async_reflect(), async_retry(), async_retryable(), async_sequence(), async_try_each(), async_whilst()

Examples

## Keep calling until it "returns" a number less than < 0.1
calls <- 0
number <- Inf
synchronise(async_until(
  function() number < 0.1,
  function() {
    calls <<- calls + 1
    number <<- runif(1)
  }
))
calls

r-lib/async documentation built on Nov. 19, 2024, 12:08 p.m.