Does `async/await` Sequentially Execute Multiple `await` Calls Like Chained Promises?

Executing Async/Await Functions Concurrently

Question:

When employing async/await in ES7/ES2016, does the sequential execution of multiple awaits mirror that of chaining .then() with promises? Specifically, will anotherCall() only commence upon the completion of someCall()?

Answer:

You have correctly interpreted the sequential nature of await.

Solution for Concurrent Execution:

To execute someCall() and anotherCall() concurrently, utilize Promise.all():

await Promise.all([someCall(), anotherCall()]);

Storing Results:

To capture the results, employ:

let [someResult, anotherResult] = await Promise.all([someCall(), anotherCall()]);

Note:

Keep in mind that Promise.all() fails promptly if any of its supplied promises reject.

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