async-iter-ext 0.3.0

Async iterator methods and async methods for option and result.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59

use std::time::Duration;

use async_iter_ext::{AsyncIterTools, iter::AsyncIterator};
use async_std::task::sleep;
use rstest::rstest;

#[rstest]
async fn test_simple_filter() {
    let items = vec![1, 2, 3];

    let filtered_items = items
        .into_iter()
        .filter_async(|i| async move {
            sleep(Duration::from_millis(100)).await;
            i == 2
        })
        .async_collect::<Vec<_>>()
        .await;

    assert_eq!(filtered_items, vec![2]);
}

#[rstest]
async fn test_multiple_filters() {
    let items = vec![1, 2, 3];

    let filtered_items = items
        .into_iter()
        .filter_async(|i| async move {
            sleep(Duration::from_millis(100)).await;
            i > 1
        })
        .filter_async(|i| async move {
            sleep(Duration::from_millis(100)).await;
            i < 3
        })
        .async_collect::<Vec<_>>()
        .await;

    assert_eq!(filtered_items, vec![2]);
}

#[rstest]
#[timeout(Duration::from_millis(400))]
async fn test_async_filter_then_sync_filter() {
    let items = vec![1, 2, 3];

    let filtered_items = items
        .into_iter()
        .filter_async(|i| async move {
            sleep(Duration::from_millis(100)).await;
            i > 1
        })
        .await
        .filter(|i| *i < 3)
        .collect::<Vec<_>>();

    assert_eq!(filtered_items, vec![2]);
}