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 if (isLength(length) &&
18 (isArray(object) || isString(object) || isArguments(object))) {
19 return baseTimes(length, String);
24 module.exports = indexKeys;