Iterate over iterator functions
loop() and collect() are helpers for iterating over
iterator functions such as generators.
loop() takes a for loop expression in which the collection
can be an iterator function.
collect() loops over the iterator and collects the values in a
list.
collect(x, n = NULL) loop(loop)
x |
An iterator function. |
n |
The number of elements to collect. If |
loop |
A |
collect() returns a list of values; loop() returns
the exhausted() sentinel, invisibly.
async_collect() for async generators.
generate_abc <- generator(function() for (x in letters[1:3]) yield(x)) abc <- generate_abc() # Collect 1 element: collect(abc, n = 1) # Collect all remaining elements: collect(abc) # With exhausted iterators collect() returns an empty list: collect(abc) # With loop() you can use `for` loops with iterators: abc <- generate_abc() loop(for (x in abc) print(x))
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