As we saw in Part 1. Error handling in callback-based asynchronous code gets messy quickly, and loses many of the qualities of synchronous code that make it familiar and easier to reason about. We introduced Promises and saw how they restore call-and-return semantics, allow errors to propagate up the stack similarly to synchronous exceptions, and generally provide a cleaner approach to managing asynchrony, especially when handling errors.

Cogniminds is ever committed to create highly engaging experiences for our clients. We leverage on our abilities and understanding as a seasoned system integrator and as a versatile design studio to consistently emerge with solution that are not only functional but also truly intuitive and interactive. Automation is useful in the work of every designer. Technology - CogniMinds play a vital role.

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There are lots of blog posts and online articles about javascript closures. Many of them are well written. Closures have also been discussed at length with Brendan Eich.

Open-source real-time framework for Web, Mobile and Internet of Things. Project provides open-source implementations of the The WebSocket Protocol. WebSocket allows bidirectional real-time messaging. On the Web and WAMP adds asynchronous Remote Procedure Calls. WAMP is ideal for distributed, multi-client and server applications. Contact us on Google Groups.