Very simply, focal-length is the distance from the lens to the film, when focused on a subject at infinity. In other words, focal length equals image distance for a far subject. To focus on something closer than infinity, the lens is moved farther away from the film or sensor. This is why most lenses get longer when you turn the focusing ring.

CSS is crafted to be simple, but over time your styles become large and your files become bloated with selectors growing out of control. Scaling simplicity is difficult.

Node.js allows you to build scalable network applications using JavaScript on the server-side. It uses the V8 JavaScript Runtime. It's written in C which makes it fast.

JQuery is a fast, small, and feature-rich JavaScript library. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers.

Google Drive is a file storage service that enables users to organize, backup, and share photos, videos, and other documents in the cloud. And allows you to access your files across many different devices, including smartphones.

Before getting into handlebars, let's look at how routing works in Ember.js. Router is solely responsible for all URLs in Ember.

Backbone collections are an ordered set of models, which only use one type of model. Customizing these collections can help your Backbone application to leverage data the way you want.

Say you are halfway done with work on a branch, but an issue with 'master' needs fixing NOW. You're not quite ready to commit what you're working on, but need to make a quick fix to master. Fear not, just stash your current changes so you can switch to master quickly.

Creating responsive web applications have been made easier with the arrival of the new JavaScript Framework Ext JS 5. In this article let's look at how we can use responsiveConfig to implement this feature.