1 var isArray = require('./isArray'),
2 isSymbol = require('./isSymbol');
4 /** Used to match property names within property paths. */
5 var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\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) {
20 var type = typeof value;
21 if (type == 'number' || type == 'symbol' || type == 'boolean' ||
22 value == null || isSymbol(value)) {
25 return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
26 (object != null && value in Object(object));
29 module.exports = isKey;