aaac7fed
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add
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/*!
* map-cache <https://github.com/jonschlinkert/map-cache>
*
* Copyright (c) 2015, Jon Schlinkert.
* Licensed under the MIT License.
*/
'use strict';
var hasOwn = Object.prototype.hasOwnProperty;
/**
* Expose `MapCache`
*/
module.exports = MapCache;
/**
* Creates a cache object to store key/value pairs.
*
* ```js
* var cache = new MapCache();
* ```
*
* @api public
*/
function MapCache(data) {
this.__data__ = data || {};
}
/**
* Adds `value` to `key` on the cache.
*
* ```js
* cache.set('foo', 'bar');
* ```
*
* @param {String} `key` The key of the value to cache.
* @param {*} `value` The value to cache.
* @returns {Object} Returns the `Cache` object for chaining.
* @api public
*/
MapCache.prototype.set = function mapSet(key, value) {
if (key !== '__proto__') {
this.__data__[key] = value;
}
return this;
};
/**
* Gets the cached value for `key`.
*
* ```js
* cache.get('foo');
* //=> 'bar'
* ```
*
* @param {String} `key` The key of the value to get.
* @returns {*} Returns the cached value.
* @api public
*/
MapCache.prototype.get = function mapGet(key) {
return key === '__proto__' ? undefined : this.__data__[key];
};
/**
* Checks if a cached value for `key` exists.
*
* ```js
* cache.has('foo');
* //=> true
* ```
*
* @param {String} `key` The key of the entry to check.
* @returns {Boolean} Returns `true` if an entry for `key` exists, else `false`.
* @api public
*/
MapCache.prototype.has = function mapHas(key) {
return key !== '__proto__' && hasOwn.call(this.__data__, key);
};
/**
* Removes `key` and its value from the cache.
*
* ```js
* cache.del('foo');
* ```
* @title .del
* @param {String} `key` The key of the value to remove.
* @returns {Boolean} Returns `true` if the entry was removed successfully, else `false`.
* @api public
*/
MapCache.prototype.del = function mapDelete(key) {
return this.has(key) && delete this.__data__[key];
};
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