The first argument in the callback is null if no error occurs; or the error if one occurs. This is a common pattern in Node.js libraries and Async.js uses this pattern. By using this style the flow between Async.js and the callbacks becomes super simple. Using Async The code that wil...
This function as it stands won't work correctly. It'll never call the callback passed in to fetchCurrentUser, meaning no user object will ever be returned. You'd expect that our test would verify this, since it's explicitly checking the value of the user's fullName property. However,...
Asynchronous patterns in Windows Runtime apps using C# and Visual Basic A typical segment of code written in C# or Visual Basic executes synchronously, meaning that when a line executes, it finishes before the next line executes. There have been previous Microsoft .NET programming models for asyn...
Verify.js A powerful, customizable asynchronous form validation library NoteThis library is no longer in active development. Buyer beware! Introduction Features Unobtrusive Easily extendable Configurable validations with parameters Fully customisable asynchronous validations...
Consuming an AsyncIterator in on-demand modeBy default, an AsyncIterator is in on-demand mode, meaning it only generates items when asked to.The read method returns the next item, or null when no item is available.const numbers = new IntegerIterator({ start: 1, end: 2 }); console.log...
Be sure your application is stateless meaning that no local data is stored in the process, for example sessions/websocket connections, session-memory and related. Use Redis, Mongo or other databases to share states between processes. Another resource on how to write efficient, production ready stat...
v2.xusers - note the timings and execution semantics for Thenable (and EagerThenable) have changed: they are now fully Promise/A+ compliant, meaning they resolve asynchronously and evaluate eagerly. Only -es7 lazyThenable mode might resolve synchronously. ...
In Chap. 12 , we discussed the basic meaning and implementation of components in detail. In this chapter, we will continue to discuss two important concepts of components, namely asynchronous components and functional components. In asynchronous components, the word "asynchronous" refers to loading ...
The resulting system was automatically parallel in a very different way than the standard meaning. Tons of tiny processes and lots of asynchronous messages ensured the system kept making forward progress, even in the face of variable latency operations like networking. My favorite demo we ever gave...
Posted in Concepts, tagged Asynchronous I/O, nio, non blocking on August 11, 2012| 1 Comment » With all the hype on highly scalable server design and the rage behind nodejs I have been meaning to do some focused reading on IO design patterns to which until now couldn’t find enough...