ES6+ Refresher

Summary

A quick pass over modern JavaScript syntax — destructuring, arrow functions, spread/rest, template literals — that you'll use constantly writing backend code.

• 1Skim a checklist of ES6+ features and confirm you're comfortable using each on the backend.
• 2Refactor an older callback-heavy script into modern async/await syntax.
• 3Focus especially on destructuring and optional chaining — they show up everywhere in API handlers.