Function keys

underscore-node-f.cjs:281–289

(obj)

// Retrieve the names of an object's own properties.
// Delegates to **ECMAScript 5**'s native `Object.keys`.
function keys(obj) {
  if (!isObject(obj)) return [];
  if (nativeKeys) return nativeKeys(obj);
  var keys = [];
  for (var key in obj) if (has$1(obj, key)) keys.push(key);
  // Ahem, IE < 9.
  if (hasEnumBug) collectNonEnumProps(obj, keys);
  return keys;
}

// Is a given array, string, or object empty?
// An "empty" object has no enumerable own-properties.