1 var baseTimes = require('./baseTimes'),
2 isArguments = require('../isArguments'),
3 isArray = require('../isArray'),
4 isLength = require('../isLength'),
5 isString = require('../isString');
8 * Creates an array of index keys for `object` values of arrays,
9 * `arguments` objects, and strings, otherwise `null` is returned.
12 * @param {Object} object The object to query.
13 * @returns {Array|null} Returns index keys, else `null`.
15 function indexKeys(object) {
16 var length = object ? object.length : undefined;
17 return (isLength(length) && (isArray(object) || isString(object) || isArguments(object)))
18 ? baseTimes(length, String)
22 module.exports = indexKeys;