1 var isArray = require('../lang/isArray'),
2 toObject = require('./toObject');
4 /** Used to match property names within property paths. */
5 var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\n\\]|\\.)*?\1)\]/,
6 reIsPlainProp = /^\w*$/;
9 * Checks if `value` is a property name and not a property path.
12 * @param {*} value The value to check.
13 * @param {Object} [object] The object to query keys on.
14 * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
16 function isKey(value, object) {
17 var type = typeof value;
18 if ((type == 'string' && reIsPlainProp.test(value)) || type == 'number') {
24 var result = !reIsDeepProp.test(value);
25 return result || (object != null && value in toObject(object));
28 module.exports = isKey;