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Await Semantics

Await pauses execution until an asynchronous operation completes.

Why this exists​

Await provides a way to write asynchronous code that looks synchronous, improving readability.

How it works​

When await is encountered, the current function yields control back to the event loop. When the awaited operation completes, execution resumes.

Examples​

fn fetchUser(id) {
  set response = await httpGet("api/users/" + id)
  return parseJson(response)
}

fn getUserData() {
  set user = await fetchUser(123)
  set posts = await fetchPosts(user.id)
  return { user: user, posts: posts }
}

# Usage
set data = await getUserData()
say data.user.name

Common mistakes​

  • Using await outside async functions
  • Forgetting that await returns the operation's result
  • Blocking the event loop with synchronous operations