Async/Await
Async/await lets you write asynchronous code that reads sequentially like synchronous code.
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📋 Copy Async/Await & Parallel Promises Template
// Parallel Async Execution with Promise.allSettled
async function loadDashboard() {
const [userData, statsData] = await Promise.all([
fetchUser(),
fetchStats()
]);
return { userData, statsData };
}⚠️ 5 Fatal Traps & JavaScript Pitfalls
Trap #1: Sequential Await Waterfall Trap
Writing
const a = await getA(); const b = await getB(); runs independent requests sequentially. Use Promise.all([getA(), getB()]) to execute in parallel.Trap #2: Unhandled Promise Rejection
Calling an async function without
await or a .catch() handler allows rejected promises to fail silently, logging unhandled rejection warnings.Trap #3: Promise.all Fast-Failure Trap
If ANY single promise in
Promise.all() rejects, the entire batch rejects immediately, discarding successful results. Use Promise.allSettled() to inspect all outcomes.Trap #4: Redundant Promise Construction Anti-Pattern
Wrapping an existing promise in
new Promise(resolve => { p.then(resolve); }) adds unnecessary wrapper overhead and breaks error chaining.Trap #5: Forgetting await in Return Statements with try/catch
Writing
try { return asyncFunc(); } catch (e) {} returns the pending promise immediately, bypassing the catch block if it rejects! Use return await asyncFunc();.💬 Frequently Asked Questions
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