12345678910111213141516171819202122232425
var baseTimes = require('./_baseTimes'),    isArguments = require('./isArguments'),    isArray = require('./isArray'),    isLength = require('./isLength'),    isString = require('./isString');
/** * Creates an array of index keys for `object` values of arrays, * `arguments` objects, and strings, otherwise `null` is returned. * * @private * @param {Object} object The object to query. * @returns {Array|null} Returns index keys, else `null`. */function indexKeys(object) {  var length = object ? object.length : undefined;  if (isLength(length) &&      (isArray(object) || isString(object) || isArguments(object))) {    return baseTimes(length, String);  }  return null;}
module.exports = indexKeys;