Implement deep clone object (không dùng structuredClone)?

Deep clone sao chép đệ quy toàn bộ nested values mà không giữ reference gốc.

function deepClone(obj) {
  if (obj === null || typeof obj !== 'object') return obj;
  const clone = Array.isArray(obj) ? [] : {};
  for (const key in obj) {
    if (obj.hasOwnProperty(key)) clone[key] = deepClone(obj[key]);
  }
  return clone;
}

Lưu ý: không handle Date, RegExp, Map, Set, circular refs.

Production dùng structuredClone() hoặc lodash.

Recursive approach: function deepClone(obj) { if (obj === null || typeof obj !== 'object') return obj; const clone = Array.isArray(obj) ? [] : {}; for (const key in obj) { if (obj.hasOwnProperty(key)) clone[key] = deepClone(obj[key]); } return clone; }

Note: does not handle Date, RegExp, Map, Set, or circular references. In production, use structuredClone() or lodash.