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