code.js

// Deep clone using structuredClone (modern browsers / Node 17+)
// structuredClone preserves Dates, RegExp, Maps, Sets, and doesn't run code.
function deepClone(obj) {
  return structuredClone(obj);
}

// Simple fallback: JSON deep copy — works for plain objects (no Date/Map/Set/functions)
function deepCloneFallback(obj) {
  return JSON.parse(JSON.stringify(obj));
}

// Usage

const original = { name: "A", meta: { joined: new Date(), tags: ["js"] } };
const copy = (typeof structuredClone === "function") ? deepClone(original) : deepCloneFallback(original);

copy.meta.tags.push("node");
console.log(original.meta.tags); // original unaffected: ["js"]