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