1 /** Used for native method references. */
2 var objectProto = Object.prototype;
4 /** Used to check objects for own properties. */
5 var hasOwnProperty = objectProto.hasOwnProperty;
8 * Checks if a cached value for `key` exists.
12 * @memberOf _.memoize.Cache
13 * @param {string} key The key of the entry to check.
14 * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
16 function mapHas(key) {
17 return key != '__proto__' && hasOwnProperty.call(this.__data__, key);
20 module.exports = mapHas;