Use the browser's localStorage API with duet by reading and writing asynchronously across threads.

$ npm install duet-local-storage

var duet         = require('duet');
var channel      = require('duet-local-storage/channel');
var localStorage = require('duet-local-storage');
var logger       = console.log.bind(console);

duet([channel], function () {
    localStorage.clear();
    localStorage.length(logger);
    // > 0
    localStorage.setItem('foo', 'bar');
    localStorage.key(0, logger);
    // > 'foo'
    localStorage.getItem('foo', logger);
    // > 'bar'
    localStorage.removeItem('foo');
});

Everything is as you would expect on the localStorage API, except for a couple of things:

• length is a method rather than a property.
• All read operations (getItem, key & length) require a callback because they need to be asynchronous.

Also, localStorage is a convenience method which executes getItem when the second argument is a callback function, and setItem when it's a string.

An example can be seen in the duet example app.