Lightweight cross-browser context persistence library à la pushState, via changing the hash fragment. Mainly meant for freeloading serverless web applications which need to store some state in the URL. Also comes with a super simple API.

• Prevents repeated processing - if the same hash is pushed twice consecutively it will not be processed twice. This is useful for example when you have some expensive calculations.
• Ability to mark hashes as processed - they will still be pushed to the browser's history stack but they will not be processed by any Stateless handlers.
• Asynchronous handlers via hooking into hashchange.

Manipulating the browser hash:

Stateless.pull()       // fires handlers
Stateless.push('1')    // #1, new history entry
Stateless.replace('2') // #2, modifies entry

Skipping a hash:

Stateless.skip('1')    // '1' pushed into set
Stateless.push('1')    // #1, Handlers not fired, '1' removed

Manipulating the handlers:

Stateless.onChange(f1) // => [f1]
Stateless.onChange(f2) // => [f1, f2]
Stateless.off(f1)      // => [f2]
Stateless.clear()      // => []

No global instances:

var stateless = Stateless.wrap(window); // your own instance