structuredClone() - Native Deep Copy

// Shallow copy - nested objects are still referenced
const copy = { ...original };

// JSON trick - loses functions, dates, undefined
const copy = JSON.parse(JSON.stringify(original));

const original = {
  name: 'Shahar',
  date: new Date(),
  nested: { value: 42 },
  set: new Set([1, 2, 3])
};

const copy = structuredClone(original);

// Modify copy - original stays unchanged
copy.nested.value = 100;
console.log(original.nested.value); // Still 42!

// ✅ Works with:
structuredClone(new Date());      // Dates
structuredClone(new Map());       // Maps
structuredClone(new Set());       // Sets
structuredClone(/regex/);         // RegExp
structuredClone(new ArrayBuffer()); // ArrayBuffer
structuredClone({ nested: {} });  // Nested objects

// ❌ Throws error:
structuredClone({ fn: () => {} });  // Functions
structuredClone(document.body);     // DOM nodes
structuredClone({ sym: Symbol() }); // Symbols

// Immutable state update
function updateUser(state, updates) {
  const newState = structuredClone(state);
  Object.assign(newState.user, updates);
  return newState;
}

// Form reset
const defaultForm = { name: '', email: '', items: [] };
function resetForm() {
  return structuredClone(defaultForm);
}