Learn more about object-oriented programming in Kotlin with a look at abstract classes, interfaces, inheritance, and type aliases.

Do you want to get started using one of the hottest new programming languages out there? Then check out our new course, Kotlin Fundamentals.

Learn how to add default and static methods to your interfaces, create repeating annotations, and use lambda expressions and method references.

Learn some cool Kotlin class properties, such as late initialization, inline properties, and extension properties, as well as advanced Kotlin class types.

The RRO framework lets you create themes that change the look of almost every app on an Android device. Learn how to use it to edit the quick settings tray.

Lambda expressions can help you process huge amounts of data with ease. See how with this in-depth look at Java 8 features you can use in Android projects.

Not to be outshone by the other WWDC announcements, the new version of Xcode is a leap forward for coders. Discover what's new in Xcode 9.

Android app templates are a huge time saver. We've combed through thousands of Android app templates available at CodeCanyon to find the 15 best available.

We've all seen that little black icon labeled "Terminal" on our Mac. Learn what the command line is, as well as some commands to get started using it.

We often need to pass data between Activities of an Android app. Learn how Parcelable makes it easy to serialize classes for sharing between Activities.

Our new course, Code a Swift App With Realm Mobile Database, shows how to let a mobile app store and retrieve data while working if the user isn't online.

Learn how to to achieve concurrency in RxJava with Schedulers, the subscribeOn() operator, the observeOn() operator, and the flatMap() operator.