var has = Object.prototype.hasOwnProperty; function dequal(foo, bar) { var ctor, len; if (foo === bar) return true; if (foo && bar && (ctor=foo.constructor) === bar.constructor) { if (ctor === Date) return foo.getTime() === bar.getTime(); if (ctor === RegExp) return foo.toString() === bar.toString(); if (ctor === Array) { if ((len=foo.length) === bar.length) { while (len-- && dequal(foo[len], bar[len])); } return len === -1; } if (!ctor || typeof foo === 'object') { len = 0; for (ctor in foo) { if (has.call(foo, ctor) && ++len && !has.call(bar, ctor)) return false; if (!(ctor in bar) || !dequal(foo[ctor], bar[ctor])) return false; } return Object.keys(bar).length === len; } } return foo !== foo && bar !== bar; } exports.dequal = dequal;