1  var isArray = require('./isArray'),
 2      isSymbol = require('./isSymbol');
 3  
 4  /** Used to match property names within property paths. */
 5  var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
 6      reIsPlainProp = /^\w*$/;
 7  
 8  /**
 9   * Checks if `value` is a property name and not a property path.
10   *
11   * @private
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`.
15   */
16  function isKey(value, object) {
17    if (isArray(value)) {
18      return false;
19    }
20    var type = typeof value;
21    if (type == 'number' || type == 'symbol' || type == 'boolean' ||
22        value == null || isSymbol(value)) {
23      return true;
24    }
25    return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
26      (object != null && value in Object(object));
27  }
28  
29  module.exports = isKey;