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async/await notation for ergonomic asynchronous IO #2394

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Merged
merged 16 commits into from
May 8, 2018
Merged

async/await notation for ergonomic asynchronous IO #2394

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f63ddca
Async/await.
Apr 5, 2018
8c3d189
Fixed typos
regexident Apr 9, 2018
7b43c7f
Merge pull request #4 from regexident/patch-1
Apr 9, 2018
7cfd755
Typo fix
aturon Apr 20, 2018
411ad1f
Add async blocks
aturon Apr 20, 2018
84c7edf
Rationale for async blocks
aturon Apr 20, 2018
41ce201
Add more rationale for lazy async fn eval
aturon Apr 20, 2018
15b6c9a
Update to match current futures APIs
aturon Apr 20, 2018
822c24c
Grab keywords
aturon Apr 20, 2018
685a588
Reorder async/move
aturon Apr 20, 2018
32b748c
Fix typos
MajorBreakfast Apr 24, 2018
0be451a
Explain use of initialization pattern
MajorBreakfast Apr 24, 2018
f43ad23
`?`-operator and control-flow constructs in async blocks
MajorBreakfast Apr 24, 2018
bcd934a
Ordering of async move keywords
MajorBreakfast Apr 24, 2018
15c2de4
Rename `async for` to `for await`
MajorBreakfast Apr 24, 2018
4059d72
RFC 2394 is async/await syntax.
May 8, 2018
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Rename async for to for await
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@MajorBreakfast
MajorBreakfast committed Apr 24, 2018
commit 15c2de48bb5efc4c49f5d32ac8ebd9a2c4fa13b7
6 changes: 3 additions & 3 deletions text/0000-async_await.md
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Expand Up @@ -571,14 +571,14 @@ There are a couple of possible solutions:
This is left as an unresolved question to find another solution or decide which
of these is least bad.

## `async for` and processing streams
## `for await` and processing streams

Another extension left out of the RFC for now is the ability to process streams
using a for loop. One could imagine a construct like `async for`, which takes
using a for loop. One could imagine a construct like `for await`, which takes
an `IntoStream` instead of an `IntoIterator`:

```rust
async for value in stream {
for await value in stream {
println!("{}", value);
}
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@MajorBreakfast MajorBreakfast Apr 21, 2018 •
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JavaScript is using the await keyword here which is IMO a better choice because async for loops await values.

It looks like this:

for await (const line of readLines(filePath)) {
  console.log(line);
}

Source: tc39 proposal for asynchronous iteration (Status: stage 4 (finished), shipping in Firefox and Chrome)

```
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