_isKey.js
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_isKey.js
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			var isArray = require('./isArray'),
			isSymbol = require('./isSymbol');

			/** Used to match property names within property paths. */
			var reIsDeepProp = /\.\|\[(?:[^[\]]\|(["'])(?:(?!\1)[^\\]\|\\.)?\1)\]/,
			reIsPlainProp = /^\w*$/;

			/**
			* Checks if `value` is a property name and not a property path.
			*
			* @private
			* @param {*} value The value to check.
			* @param {Object} [object] The object to query keys on.
			* @returns {boolean} Returns `true` if `value` is a property name, else `false`.
			*/
			function isKey(value, object) {
			if (isArray(value)) {
			return false;
			}
			var type = typeof value;
			if (type == 'number' \|\| type == 'symbol' \|\| type == 'boolean' \|\|
			value == null \|\| isSymbol(value)) {
			return true;
			}
			return reIsPlainProp.test(value) \|\| !reIsDeepProp.test(value) \|\|
			(object != null && value in Object(object));
			}

			module.exports = isKey;