JavaScript library for storing and retrieving complex objects in localStorage or sessionStorage.

In the following examples, this class is used to represent a complex object that we want to store.

class Person { constructor(id, firstname, lastname) { this.id = id; this.firstname = firstname; this.lastname = lastname; } }

HashTables can be backed by either the localStorage or sessionStorage depending on which implementation is used.

var localTable = new LocalHashTable('my_table', person => person.id); var sessionTable = new SessionHashTable('my_table', person => person.id);

The namespace string is later used to find the HashTable after the browser is refreshed and the lambda expression determines how the uniquely identify a value. The identifier must return a number.

// Write values individually table.put(new Person(1, "Adam", "Adamsson")); table.put(new Person(2, "Bert", "Bertsson")); table.put(new Person(3, "Carl", "Carlsson")); // Write many values at once table.putAll([ new Person(4, "Dave", "Davesson"), new Person(5, "Eric", "Ericsson"), new Person(6, "Fred", "Fredsson") ]); // Overwrite an existing value table.put(new Person(1, "Adam2", "Adamsson2"));

// Get individual values var adam = table.get(1); var bert = table.put(2); var carl = table.put(3); // Get array of keys var keys = table.keys(); // Get many values var people = table.values();

// Delete 'Bert' from the table table.delete(2);

Copyright 2017 Emil Forslund

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0 

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.