asynchronous

name	asynchronous
description	Master asynchronous JavaScript patterns including callbacks, promises, async/await, event loop mechanics, and real-world async patterns.
sasmp_version	1.3.0
bonded_agent	04-asynchronous-javascript
bond_type	PRIMARY_BOND
skill_type	reference
response_format	code_first
max_tokens	1500
parameter_validation	{"required":["topic"],"optional":["pattern_type"]}
retry_logic	{"on_ambiguity":"ask_clarification","fallback":"show_async_await_first"}
observability	{"entry_log":"Async skill activated","exit_log":"Async reference provided"}

Asynchronous JavaScript Skill

Quick Reference Card

Event Loop Order

1. Call Stack (sync code)
2. Microtasks (Promise.then, queueMicrotask)
3. Macrotasks (setTimeout, setInterval, I/O)

console.log('1');                    // Sync
setTimeout(() => console.log('2'), 0);  // Macro
Promise.resolve().then(() => console.log('3')); // Micro
console.log('4');                    // Sync
// Output: 1, 4, 3, 2

Promise Basics

// Create
const promise = new Promise((resolve, reject) => {
  if (success) resolve(value);
  else reject(new Error('Failed'));
});

// Chain
fetch('/api/data')
  .then(res => res.json())
  .then( => (data))
  .( (err))
  .( ());