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Comparison with JS Async

Kexra's async model differs from JavaScript's in simplicity and determinism.

Why this exists​

Understanding the differences helps developers transitioning from JavaScript or working with both languages.

How it works​

Unlike JavaScript's complex Promise/microtask system, Kexra uses a simple event loop with deterministic execution order.

Examples​

# JavaScript (non-deterministic order possible)
async function jsExample() {
  console.log(1);
  setTimeout(() => console.log(2), 0);
  await Promise.resolve();
  console.log(3);
}
// Output: 1, 3, 2 (or 1, 2, 3 depending on timing)

# Kexra (deterministic)
fn kexraExample() {
  say 1
  schedule(() => say 2, 0)
  await yield()
  say 3
}
# Output: 1, 3, 2 (always in this order)

Common mistakes​

  • Assuming Kexra async behaves like JavaScript
  • Expecting non-deterministic timing behavior