pub async fn extend<'a, C, T, S>(collection: &mut C, stream: S) where
C: Extend<T>,
S: IntoStream<Item = T> + 'a,
<S as IntoStream>::IntoStream: Send,
Expand description
Extends a collection with the contents of a stream.
Streams produce a series of values asynchronously, and collections can also be thought of as a
series of values. The Extend
trait bridges this gap, allowing you to extend a collection
asynchronously by including the contents of that stream. When extending a collection with an
already existing key, that entry is updated or, in the case of collections that permit multiple
entries with equal keys, that entry is inserted.
Examples
use async_std::prelude::*;
use async_std::stream;
let mut v: Vec<usize> = vec![1, 2];
let s = stream::repeat(3usize).take(3);
stream::extend(&mut v, s).await;
assert_eq!(v, vec![1, 2, 3, 3, 3]);