View source: R/iterator-collect.R
async_collect | R Documentation |
async_collect()
takes an asynchronous iterator, i.e. an iterable
function that is also awaitable. async_collect()
returns an
awaitable that eventually resolves to a list containing the values
returned by the iterator. The values are collected until exhaustion
unless n
is supplied. The collection is grown geometrically for
performance.
async_collect(x, n = NULL)
x |
An iterator function. |
n |
The number of elements to collect. If |
# Emulate an async stream by yielding promises that resolve to the # elements of the input vector generate_stream <- async_generator(function(x) for (elt in x) yield(elt)) # You can await `async_collect()` in an async function. Once the # list of values is resolved, the async function resumes. async(function() { stream <- generate_stream(1:3) values <- await(async_collect(stream)) values })
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