function set(obj, key, val) { if (typeof val.value === 'object') val.value = klona(val.value); if (!val.enumerable || val.get || val.set || !val.configurable || !val.writable || key === '__proto__') { Object.defineProperty(obj, key, val); } else obj[key] = val.value; } function klona(x) { if (typeof x !== 'object') return x; var i=0, k, list, tmp, str=Object.prototype.toString.call(x); if (str === '[object Object]') { tmp = Object.create(x.__proto__ || null); } else if (str === '[object Array]') { tmp = Array(x.length); } else if (str === '[object Set]') { tmp = new Set; x.forEach(function (val) { tmp.add(klona(val)); }); } else if (str === '[object Map]') { tmp = new Map; x.forEach(function (val, key) { tmp.set(klona(key), klona(val)); }); } else if (str === '[object Date]') { tmp = new Date(+x); } else if (str === '[object RegExp]') { tmp = new RegExp(x.source, x.flags); } else if (str === '[object DataView]') { tmp = new x.constructor( klona(x.buffer) ); } else if (str === '[object ArrayBuffer]') { tmp = x.slice(0); } else if (str.slice(-6) === 'Array]') { // ArrayBuffer.isView(x) // ~> `new` bcuz `Buffer.slice` => ref tmp = new x.constructor(x); } if (tmp) { for (list=Object.getOwnPropertySymbols(x); i < list.length; i++) { set(tmp, list[i], Object.getOwnPropertyDescriptor(x, list[i])); } for (i=0, list=Object.getOwnPropertyNames(x); i < list.length; i++) { if (Object.hasOwnProperty.call(tmp, k=list[i]) && tmp[k] === x[k]) continue; set(tmp, k, Object.getOwnPropertyDescriptor(x, k)); } } return tmp || x; } exports.klona = klona;