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(function(root) {
var localStorageMemory = {};
var cache = {};
/**
* number of stored items.
*/
localStorageMemory.length = 0;
/**
* returns item for passed key, or null
*
* @para {String} key
* name of item to be returned
* @returns {String|null}
*/
localStorageMemory.getItem = function(key) {
return cache[key] || null;
};
/**
* sets item for key to passed value, as String
*
* @para {String} key
* name of item to be set
* @para {String} value
* value, will always be turned into a String
* @returns {undefined}
*/
localStorageMemory.setItem = function(key, value) {
if (typeof value === 'undefined') {
localStorageMemory.removeItem(key);
} else {
if (!(cache.hasOwnProperty(key))) {
localStorageMemory.length++;
}
cache[key] = '' + value;
}
};
/**
* removes item for passed key
*
* @para {String} key
* name of item to be removed
* @returns {undefined}
*/
localStorageMemory.removeItem = function(key) {
if (cache.hasOwnProperty(key)) {
delete cache[key];
localStorageMemory.length--;
}
};
/**
* returns name of key at passed index
*
* @para {Number} index
* Position for key to be returned (starts at 0)
* @returns {String|null}
*/
localStorageMemory.key = function(index) {
return Object.keys(cache)[index] || null;
};
/**
* removes all stored items and sets length to 0
*
* @returns {undefined}
*/
localStorageMemory.clear = function() {
cache = {};
localStorageMemory.length = 0;
};
root.localStorageMemory = localStorageMemory;
})(window);
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